A pre-stranded wire shearing device and forming machine

Abstract

The utility model belongs to the technical field of mechanical manufacturing, concretely relates to a pre-stranding wire shearing device and forming machine, including frame and tool rest, be provided with shearing cutter on the tool rest, the right side fixed of frame has pneumatic cylinder, the piston rod of pneumatic cylinder stretches out to left and its end fixedly connected with a guide plate, the left side of guide plate upper surface is fixed with shearing seat and support seat along the front -back direction of frame at intervals, shearing seat and support seat jointly install a guide tube of accommodating pre-stranding wire, the silk outlet of guide tube is towards shearing seat and is away from the side of tool rest, the side of shearing seat face to tool rest and the side of shearing cutter away from tool rest slide contact and mutually cooperate to realize shearing. The utility model has solved the problem of response lag, reduced shearing vibration and error, fundamentally eliminated the problem of inaccurate positioning caused by the action of multiple components respectively, cumulative error, ensured that the cutting length of each pre-stranding wire has extremely high consistency.

Description

Technical Field

[0001] This utility model belongs to the technical field of mechanical manufacturing, specifically relating to a pre-twisted wire shearing device and a forming machine. Background Technology

[0002] Pre-twisted wire is used in connecting fittings for overhead power conductors and overhead optical cables, including terminals, suspensions, and joints. It involves pre-twisting metal wires into segments with a specific helical shape to provide excellent holding power and fatigue resistance. Most pre-twisted wire production equipment is developed in-house, lacking standardized models and resulting in significant performance variations. A typical pre-twisted wire forming machine usually includes a wire feeding device, a tension adjustment device, a forming device, and a shearing device. Shearing, as the final forming process, directly affects the consistency of pre-twisted wire length and cross-sectional quality. Currently, pre-twisted wire shearing methods mostly rely on manual or simple mechanical operations, leading to inconsistent cutting lengths, uneven cuts, and low production efficiency, making it difficult to meet the precision and efficiency requirements of mass production.

[0003] Existing technologies include research on automated cutting of pre-twisted wire, such as patent CN206382476U - Automatic Cutting Machine for Pre-twisted Wire. This mechanism uses gear transmission to drive a rotating cutter head for cutting. However, its structure is complex and inconvenient to adjust, and it still suffers from inaccurate positioning and lag in response during continuous production, affecting the overall coordination and stability of the production line. Therefore, a new technical solution is needed to address these problems. Utility Model Content

[0004] The purpose of this utility model is to provide a pre-twisted wire cutting device and forming machine to solve the problems mentioned in the background art, such as the complex structure and inconvenient adjustment of the current pre-twisted wire cutting machine, and the defects such as inaccurate positioning and delayed response in continuous production, which affect the coordination and stability of the overall production line.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pre-twisted wire shearing device, comprising a frame and a blade holder vertically fixed to the left side of the frame, wherein a shearing blade is mounted on the blade holder, and a cylinder is fixed to the right side of the frame, wherein the piston rod of the cylinder extends to the left and its end is fixedly connected to a guide plate, wherein a shearing seat and a support seat are fixedly fixed at intervals along the front-back direction of the frame on the left side of the upper surface of the guide plate, wherein a guide tube for accommodating pre-twisted wire is mounted together on the shearing seat and the side away from the blade holder, wherein the side of the shearing seat facing the blade holder slides in contact with and cooperates with the side of the shearing blade away from the blade holder to achieve shearing, wherein a slider extending along the left-right direction of the frame is provided on the lower surface of the guide plate, and a guide rail cooperating with the slider is provided on the frame, wherein when the cylinder drives the piston rod to extend and retract, it drives the guide plate to slide along the guide rail, thereby driving the guide tube, the shearing seat and the support seat to move together along the left-right direction of the frame through the guide plate.

[0006] Furthermore, a counter A is provided on the side of the blade holder on the frame. The sensing end of the counter A faces and contacts the side of the guide plate away from the cylinder. The counter A includes a spring cylinder A and a sliding rod A that is elastically and telescopically disposed in the spring cylinder A. The end of the sliding rod A is provided with a sensing contact A that abuts against the guide plate. The side of the guide plate away from the cylinder is provided with a first trigger part. When the guide plate slides to the shearing position where the shearing seat and the shearing blade cooperate, the first trigger part squeezes the sensing contact A and causes the sliding rod A to retract into the spring cylinder A.

[0007] Furthermore, a counter B is provided on the frame next to the cylinder, with the sensing end of the counter B facing and contacting the side of the guide plate near the cylinder; the counter B includes a spring cylinder B and a sliding rod B elastically telescopically disposed within the spring cylinder B, with a sensing contact B at the end of the sliding rod B that abuts against the guide plate; a second triggering part is provided on the side of the guide plate near the cylinder, and when the guide plate slides to a reset position away from the tool holder, the second triggering part presses the sensing contact B and causes the sliding rod B to retract into the spring cylinder B.

[0008] Furthermore, a wire guide hole is provided on the upper left part of the shearing seat, and the wire guide hole is coaxially arranged with the wire outlet of the wire guide cylinder; when the piston rod of the cylinder drives the guide plate to slide the shearing seat to the shearing position close to the blade holder, the shearing blade is tangent to the front side of the shearing seat and cooperates with the wire guide hole to cut the pre-twisted wire.

[0009] In addition to the above technical solutions, there is also a forming machine equipped with the pre-twisted wire shearing device.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model adopts a mechanism that directly drives the guide plate with a cylinder, causing the shearing seat, support seat, and guide drum to move synchronously. This eliminates the need for complex mechanical transmission mechanisms, greatly improving equipment reliability and significantly enhancing the cross-sectional quality of the pre-twisted wire. Utilizing the rapid action and high output force of the cylinder drive, the problem of response lag is solved, ensuring that the shearing seat can quickly and accurately reach the shearing position, making it particularly suitable for high-speed, continuous production. Through the sliding contact mechanism between the shearing seat and the shearing blade, the shearing seat, under the linear drive of the cylinder guide plate, can move to "find" the shearing blade and then complete the shearing of the pre-twisted wire, forming an innovative "moving anvil, stationary blade" layout, ensuring the feeding of the guide drum. The shearing action of the wire and the shearing blade can be integrated, so that after the pre-twisted wire is fed out from the guide drum, it can be directly fed into the shearing station by the same drive system without the need for an additional transfer mechanism, ensuring the continuity of the shearing action. On this basis, the guide drum, shearing seat and drive unit (i.e., the cylinder piston rod is connected by the guide plate) are rigidly connected into a whole. Through the cooperation of the slider and the guide rail, it is constrained to only make high-precision linear motion in the left and right direction of the frame (i.e. the shearing direction), which effectively reduces shearing vibration and error, and fundamentally eliminates the problem of inaccurate positioning caused by the separate operation and cumulative error of multiple components. This ensures that the cutting length of each pre-twisted wire has extremely high consistency and significantly improves the product qualification rate. 2. This utility model utilizes the first and second triggering parts on the guide plate, combined with the sensing contact and sliding rod structure of the mechanical counter (counter A and counter B), to realize the automatic identification and feedback control of the shearing station and the reset station, forming a closed-loop control system. This improves the response speed and positioning accuracy, significantly increases production efficiency, and reduces the need for manual intervention. The counting function of the counter accurately records the number of shearing operations, providing data support for production statistics and fault diagnosis. This solves the problems of low efficiency and product quality fluctuations caused by insufficient automation in existing technologies, and realizes continuous, efficient, and stable automated production. 3. This utility model adopts a design in which the guide hole and the guide cylinder are coaxial, which ensures that the pre-twisted wire always maintains linear motion during the shearing process, effectively reduces the swaying and offset of the pre-twisted wire during the conveying process, further ensures the accuracy of the shearing position, eliminates shearing defects caused by unstable wire feeding from the source, solves the problem of inconsistent length caused by manual or simple mechanical operation in the prior art, and significantly improves the length accuracy of the pre-twisted wire section in mass production. 4. This utility model employs a design where the shearing blade is tangent to the front side of the shearing seat and engages with the guide hole for shearing. The guide hole acts as a "fixed blade" or "anvil hole," providing stable constraint on the pre-twisted wire. This achieves uniform distribution of shearing force, effectively reducing burrs and tilting defects at the cut, ensuring cut smoothness, and solving the cut quality problem caused by unstable operation. It significantly improves the gripping force and fatigue resistance of the pre-twisted wire connection to the fittings, while also fixing the shearing point, reducing wire fraying at the pre-twisted wire end, improving product quality, and seamlessly connecting with the wire outlet of the forming machine to achieve continuous shearing operations, significantly improving production efficiency. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the pre-twisted wire shearing device of this utility model in a non-shearing state. Figure 2 This is a schematic diagram of the pre-twisted wire shearing device of this utility model in the shearing state; Figure 3 for Figure 1 or Figure 2 A schematic diagram of the right side structure; Figure 4 for Figure 1 or Figure 2 A schematic diagram of the left side structure.

[0012] The components are as follows: 1. Frame; 2. Tool holder; 3. Shearing blade; 4. Cylinder; 401. Piston rod; 5. Guide plate; 501. First triggering part; 502. Second triggering part; 6. Shearing seat; 601. Wire guide hole; 7. Support seat; 8. Pre-twisted wire; 9. Wire guide cylinder; 901. Wire outlet; 10. Slider; 11. Guide rail; 12. Counter A; 1201. Spring cylinder A; 1202. Sensing contact A; 1203. Sliding rod A; 13. Counter B; 1301. Spring cylinder B; 1302. Sensing contact B; 1303. Sliding rod B. Detailed Implementation

[0013] The following embodiments are used to further illustrate the content of this utility model, and do not limit the application of this utility model. Example 1:

[0014] Please see Figures 1-4This embodiment provides a pre-twisted wire shearing device, including a frame 1 and a blade holder 2 vertically fixed to the left side of the frame 1. A shearing blade 3 is mounted on the blade holder 2. A cylinder 4 is fixed to the right side of the frame 1. The piston rod 401 of the cylinder 4 extends to the left, and its end is fixedly connected to a guide plate 5. A shearing seat 6 and a support seat 7 are fixedly fixed at intervals along the front-rear direction of the frame 1 on the left side of the upper surface of the guide plate 5. A guide tube 9 for accommodating pre-twisted wire 8 is mounted together on the shearing seat 6. The wire outlet 901 of the guide tube 9 faces the side of the shearing seat 6 away from the blade holder 2. The shearing... The side of the seat 6 facing the knife holder 2 and the side of the shearing knife 3 facing away from the knife holder 2 slide in contact and cooperate with each other to achieve shearing. The lower surface of the guide plate 5 is provided with a slider 10 extending along the left and right direction of the frame 1. The frame 1 is provided with a guide rail 11 that cooperates with the slider 10. When the cylinder 4 drives the piston rod 401 to extend and retract, it drives the guide plate 5 to slide along the guide rail 11. Then, through the guide plate 5, the wire guide tube 9, the shearing seat 6 and the support seat 7 move together along the left and right direction of the frame 1, so that the wire guide tube 9 supported by the shearing seat 6 and the support seat 7 can move with the sliding of the guide plate 5. The upper left part of the shearing seat 6 is provided with a wire guide hole 601, which is coaxially arranged with the wire outlet 901 of the wire guide cylinder 9. When the piston rod 401 of the cylinder 4 drives the guide plate 5 to slide the shearing seat 6 to a shearing position close to the knife holder 2 and where the shearing seat 6 and the shearing knife 3 cooperate, the shearing knife 3 is tangent to the front side of the shearing seat 6 and cooperates with the wire guide hole 601 to cut the pre-twisted wire 8.

[0015] Please see Figures 1-2 A counter A12 is provided on the frame 1 next to the tool holder 2 (the basic counting structure of the existing counter A is not described in detail here, but its function should not be limited). The sensing end of the counter A12 faces and contacts the side of the guide plate 5 away from the cylinder 4. A counter B13 is provided on the frame 1 next to the cylinder 4 (the basic counting structure of the existing counter B is not described in detail here, but its function should not be limited). The sensing end of the counter B13 faces and contacts the side of the guide plate 5 closer to the cylinder 4. The counter A12 includes a spring cylinder A1201 and a sliding rod A1203 that is elastically and telescopically disposed in the spring cylinder A1201. The end of the sliding rod A1203 is provided with a sensing contact A1202 that abuts against the guide plate 5. The guide plate 5 is provided with a first trigger part 501 on the side away from the cylinder 4. When the guide plate 5 slides to the shearing position close to the knife holder 2 and the shearing seat 6 cooperates with the shearing knife 3, the first trigger part 501 presses the sensing contact A1202 and causes the sliding rod A1203 to retract into the spring cylinder A1201. The counter B13 includes a spring cylinder B1301 and a sliding rod B1303 that is elastically and telescopically disposed in the spring cylinder B1301. The end of the sliding rod B1303 is provided with a sensing contact B1302 that abuts against the guide plate 5. The guide plate 5 is provided with a second trigger part 502 on the side near the cylinder 4. When the guide plate 5 slides to the reset position away from the tool holder 2, the second trigger part 502 presses the sensing contact B1302 and causes the sliding rod B1303 to retract into the spring cylinder B1301. The "retraction" of the aforementioned sliding rods A1203 and B1303 is a clear physical signal that can be acquired by an external system (such as a PLC), providing key feedback for achieving automated cycles: the shearing action is executed simultaneously when counter A12 issues a "reached shearing station" signal; the next wire feeding and shearing is performed simultaneously when counter B13 issues a "returned to station" signal, forming a robust and reliable mechanical closed-loop control system that completely solves the problems of "inaccurate positioning" and "response lag".

[0016] The working principle and usage process of this utility model are as follows: Figures 1-4 As illustrated, after the pre-twisted wire shearing device is assembled, the operator installs the entire device onto the forming machine (the functions and structures of conventional equipment such as forming machines are well known in the field, and the connection settings are also common knowledge, so they will not be described in detail here, nor are they shown in the attached drawings). The purpose is to eliminate the complex mechanical transmission mechanism, greatly improve the reliability of the equipment, and significantly improve the cross-sectional quality of the pre-twisted wire. It not only solves the problem of response lag, ensuring that the shearing seat can quickly and accurately reach the shearing position, but also ensures the continuity of the shearing action, reduces shearing vibration and error, and fundamentally eliminates the problem of inaccurate positioning caused by the separate operation and cumulative error of multiple components. It ensures that the cutting length of each pre-twisted wire has extremely high consistency, and significantly improves the product qualification rate.

[0017] When the pre-twisted wire 8 needs to be cut, the operator must first guide the pre-twisted wire 8 produced on the forming machine into the guide tube 9, introduce it into the guide hole 601 through the wire outlet 901, and then pass it out through the guide hole 601. Since the wire outlet end of the forming machine is seamlessly connected to the cutting device, the pre-twisted wire 8 will continuously pass out from the guide hole 601 during the forming machine's production. Because the counters A12 and B13 are connected to a controller with a built-in PLC programming system (the functions and structures of controllers and other conventional equipment are well known in the art, and the connection settings are also common knowledge, so they will not be described in detail here, nor are they shown in the attached drawings), and the cylinder 4 is also controlled by the controller, and because the pre-twisted wire... When the wire 8 is in the non-cutting state, i.e., the piston rod 401 of the cylinder 4 is in the retracted state, the guide plate 5 is on the right side of the frame 1. At this time, the second trigger part 502 will continuously press the sensing contact B1302, forcing the sliding rod B1303 to be continuously retracted into the spring cylinder B1301 and transmitting the retraction signal to the controller. The controller's built-in PLC programming system collects the retraction length of the sliding rod B1303 and records the retraction time, thereby obtaining the length of the pre-twisted wire 8 passing through the wire guide hole 601. After the length of the pre-twisted wire 8 meets the cutting requirements, the operator will control the cylinder 4 to extend the piston rod 401 through the operating controller. At this time, the guide plate 5 will be along the guide rail 1 below the extension of the piston rod 401. The guide plate 5 slides to the left side of the frame 1, allowing the guide tube 9, shearing seat 6, and support seat 7 to move synchronously to the left side of the frame 1 along with the sliding of the guide plate 5. This continues until the first trigger part 501 presses the sensing contact A1202, forcing the sliding rod A1203 to retract into the spring cylinder A1201 and transmitting a retraction signal to the controller. The controller's built-in PLC programming system collects the retraction length of the sliding rod A1203 and records the retraction time, thus determining that the pre-twisted wire 8 has reached the shearing station and performs the shearing action: as the shearing seat 6 moves towards the shearing blade 3, the blade of the shearing blade 3 smoothly shears the pre-twisted wire 8 that has moved with the shearing seat 6 to the shearing blade 3, thereby obtaining the corresponding length. While the pre-twisted wire 8 is in place, the operating controller controls the cylinder 4 to quickly retract the piston rod 401. At this time, the guide plate 5 will slide rapidly along the guide rail 11 to the right side of the frame 1 under the retraction of the piston rod 401, so that the guide tube 9, the shearing seat 6 and the support seat 7 can move rapidly to the right side of the frame 1 in sync with the sliding of the guide plate 5, until the second trigger part 502 squeezes the sensing contact B1302, forcing the sliding rod B1303 to retract into the spring cylinder B1301 and transmit the retraction signal to the controller. The controller's built-in PLC programming system collects the retraction length of the sliding rod B1303 and records the retraction time, thereby knowing that the pre-twisted wire 8 has reached the reset position, and then performs the next wire feeding and shearing. Example 2:

[0018] Please see Figures 1-4As another objective of this utility model, a forming machine is provided, in which the above-mentioned pre-twisted wire cutting device is provided. Therefore, the forming machine can obtain any of the beneficial effects of the pre-twisted wire cutting device described above, which will not be repeated here.

Claims

1. A pre-stranded wire shearing device comprising a frame and a tool holder vertically fixed to the left side of the frame, a shearing tool is installed on the tool holder, characterized in that, A cylinder is fixed to the right side of the frame. The piston rod of the cylinder extends to the left and its end is fixedly connected to a guide plate. A shearing seat and a support seat are fixed at intervals along the front-back direction of the frame on the upper left side of the guide plate. The shearing seat and the support seat are jointly mounted with a guide tube that accommodates pre-twisted wire. The wire outlet of the guide tube faces the side of the shearing seat away from the blade holder. The side of the shearing seat facing the blade holder slides in contact with the side of the shearing blade away from the blade holder and cooperates with each other to achieve shearing. The lower surface of the guide plate is provided with a slider extending along the left-right direction of the frame. The frame is provided with a guide rail that cooperates with the slider. When the cylinder drives the piston rod to extend and retract, it drives the guide plate to slide along the guide rail, and then drives the guide tube, the shearing seat and the support seat to move together along the left-right direction of the frame through the guide plate.

2. A preformed wire shearing device according to claim 1 wherein, A counter A is provided on the frame next to the tool holder, and the sensing end of the counter A faces and contacts the side of the guide plate away from the cylinder.

3. A preformed wire shearing device according to claim 2, wherein, The counter A includes a spring cylinder A and a sliding rod A that is elastically and telescopically disposed within the spring cylinder A. The end of the sliding rod A is provided with a sensing contact A that abuts against a guide plate.

4. A preformed wire shearing device according to claim 3, wherein, The guide plate is provided with a first trigger part on the side away from the cylinder. When the guide plate slides to the shearing position where the shearing seat and the shearing blade cooperate, the first trigger part presses the sensing contact A and causes the sliding rod A to retract into the spring cylinder A.

5. A preformed wire shearing device according to claim 1 wherein, A counter B is provided on the frame next to the cylinder, and the sensing end of the counter B faces and contacts the side of the guide plate close to the cylinder.

6. A preformed wire shearing device according to claim 5, wherein, The counter B includes a spring cylinder B and a sliding rod B that is elastically and telescopically disposed within the spring cylinder B. The end of the sliding rod B is provided with a sensing contact B that abuts against the guide plate.

7. A preformed wire shearing device according to claim 6, wherein, The guide plate is provided with a second trigger part on the side near the cylinder. When the guide plate slides to the reset position away from the tool holder, the second trigger part presses the sensing contact B and causes the sliding rod B to retract into the spring cylinder B.

8. A preformed wire shearing device according to claim 1 wherein, The upper left part of the shearing seat has a wire guide hole, which is coaxially arranged with the wire outlet of the wire guide tube.

9. A preformed wire shearing device according to claim 8, wherein, When the piston rod of the cylinder drives the guide plate to slide the shearing seat to the shearing position close to the blade holder, the shearing blade is tangent to the front side of the shearing seat and cooperates with the wire guide hole to cut the pre-twisted wire.

10. A forming machine, comprising the pre-twisted wire cutting device as described in any one of claims 1-9.

Images