Bridge anti-jamming steel strand threading machine

Abstract

This utility model relates to a bridge-use anti-jamming steel strand threading machine, belonging to the field of auxiliary equipment technology. It includes a base frame, on which a motor and a wire harness conveying device are connected. The input end of the wire harness conveying device is connected to the output end of the motor for conveying steel strands. Its output end is equipped with several wheel sets, each wheel set containing corresponding upper and lower pressure rollers, with the steel strand being conveyed between the two pressure rollers. An anti-jamming device is installed along the steel strand's travel path. This device includes an outer positioning sleeve and an inner guide sleeve. The outer positioning sleeve is connected to the wire harness conveying device and has an outer guide groove corresponding to the steel strand's travel path and the pressure rollers. The inner guide sleeve is coaxially connected to the inside of the outer positioning sleeve and has an inner guide groove corresponding to the pressure rollers. The inner guide groove has a guide portion on one side of the guide wheel set's outlet end, extending to the outer guide groove. The outer guide groove can restrict the rotation of the inner guide sleeve through the guide portion. This threading machine greatly improves threading efficiency, avoids disassembling the housing for threading, and effectively simplifies the threading operation.

Description

Technical Field

[0001] This utility model relates to a bridge anti-jamming steel strand threading machine, belonging to the field of auxiliary equipment technology. Background Technology

[0002] Post-tensioned prestressed concrete technology has been widely used in the construction of large-scale infrastructure projects such as modern highways, railways, bridges, water conservancy dams, and high-rise buildings. The core of this technology is to pre-drill ducts (usually metal or plastic corrugated pipes) inside the concrete member. After the concrete reaches the specified strength, high-strength steel strand bundles are threaded into these ducts, and prestress is then applied using tensioning equipment. The threading of the steel strands is a crucial step in this process, and its efficiency and quality directly affect the progress and safety of the entire project.

[0003] In the early days, strand threading was mainly done manually, which had many drawbacks, including low efficiency, high labor intensity, high safety risks, and easy damage to the steel strands. To solve these problems, mechanical steel strand threading machines were developed. As shown in Chinese Utility Model Patent Publication No. CN216476408U, such equipment typically consists of a motor, a reducer, a conveying mechanism (such as a pressure roller assembly), and a frame. Its working principle is that the motor drives the pressure roller assembly, which uses the friction between the pressure rollers and the steel strands to forcefully push them into the pre-drilled channels.

[0004] To ensure construction safety and prevent clothing, hands, and other items from being caught in the high-speed rotating pressure rollers, existing threading machines typically have a fully or semi-enclosed protective shell around the transmission mechanism. However, the inventors discovered in practice that while this protective shell provides safety, it also introduces new technical challenges to actual operation.

[0005] Specifically, due to the obstruction of the casing, operators cannot directly observe the alignment of the steel strand head with the machine's outlet (usually a guide sleeve). This causes the steel strand head to easily misalign and hit the edge of the outlet sleeve during the initial threading stage after being pushed by the last set of pressure rollers, preventing it from passing through smoothly. To solve this problem, workers have to repeatedly start and stop the machine, making multiple attempts, or adopt a more cumbersome method: first removing the protective casing, and then reinstalling it after the steel strand has successfully passed through the outlet.

[0006] This method of operation not only greatly reduces the initial efficiency of threading and increases the workload of workers, but also the frequent disassembly and assembly may lead to damage or loss of shell components, thus leaving new safety hazards. Utility Model Content

[0007] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a bridge anti-jamming steel strand threading machine, which greatly improves the threading efficiency of the steel strand threading machine and avoids disassembling the housing for threading.

[0008] The bridge anti-jamming steel strand threading machine of this utility model includes:

[0009] The base frame is equipped with a motor and a wire harness conveyor.

[0010] A wire harness conveying device is used to convey steel strands. The input end of the wire harness conveying device is connected to the output end of a motor. The output end of the wire harness conveying device is equipped with several wheel sets, each wheel set including pressure rollers arranged vertically and horizontally. The steel strands are conveyed between the two pressure rollers arranged vertically and horizontally.

[0011] The steel strand's travel path is equipped with anti-jamming devices, which include:

[0012] The outer positioning sleeve is connected to the wire harness conveying device and is set on the travel path of the steel strand, with an outer guide groove opened on the corresponding pressure roller.

[0013] The inner guide sleeve is coaxially connected to the inside of the outer positioning sleeve. The inner guide groove is provided corresponding to the pressure roller. The inner guide groove is located on the side of the cable outlet of the guide wheel assembly and has a guide part. The guide part extends into the outer guide groove. The outer guide groove can restrict the rotation of the inner guide sleeve through the guide part.

[0014] Furthermore, the outer positioning sleeve is a split design, which consists of two semi-circular sleeves.

[0015] Furthermore, the outer positioning sleeve is a semi-circular sleeve with a positioning surface for connecting to the wire harness conveying device, and the outer positioning sleeve is connected to the wire harness conveying device by abutting against the positioning surface.

[0016] Furthermore, the semi-circular sleeve has a mounting surface on its inner side opposite to the positioning surface, and a number of elongated slots are provided on the mounting surface.

[0017] Furthermore, the outer positioning sleeve has positioning plates on both sides, the inner guide sleeve has a positioning ring on one side and a locking sleeve on the other side, and the positioning ring and locking sleeve abut against the positioning plates on both sides respectively.

[0018] Furthermore, the wire harness conveying device has a separate conveying chamber at the position of the wheel assembly, with an outer positioning sleeve installed inside the conveying chamber and the inner guide sleeve extending out of the conveying chamber at both ends.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This invention creates a highly efficient guiding structure by incorporating an inner guide sleeve with a flared guide portion. It actively corrects and guides the skewed head of the steel strand to the outlet center, fundamentally solving the problem of steel strand jamming caused by shell obstruction or misalignment, thus significantly improving the success rate of threading on the first attempt.

[0021] This invention enables smooth cable threading even with the safety housing installed throughout the process. This ensures that the safety protection device is always operational, avoiding the risk of exposing workers to rotating parts during housing disassembly, and also preventing safety hazards caused by frequent disassembly and assembly leading to housing damage or forgetting to install the safety housing.

[0022] The design employs an inner and outer double sleeve structure, which has a clear function and avoids the distance requirement between two adjacent wheelsets. The inner guide sleeve makes the cable threading between wheelsets smoother. Regardless of the number of wheelsets used, it can all be achieved by extending the inner guide sleeve, which greatly improves the compatibility of the structure. Attached Figure Description

[0023] Figure 1 This is one of the structural schematic diagrams of Embodiment 1 of this utility model;

[0024] Figure 2 This is a second structural schematic diagram of Embodiment 1 of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure after removing the outer semi-circular sleeve of the outer positioning sleeve in Embodiment 1 of this utility model;

[0026] Figure 4 This is a left view of Embodiment 1 of this utility model after removing the outer semi-circular sleeve of the outer positioning sleeve;

[0027] Figure 5 This is a schematic diagram of the structure after removing the inner guide sleeve in Embodiment 1 of this utility model;

[0028] Figure 6 This is a left view of Embodiment 1 of this utility model after the inner guide sleeve has been removed;

[0029] Figure 7 This is a schematic diagram of the inner guide sleeve structure of Embodiment 1 of this utility model;

[0030] Figure 8 This is one of the schematic diagrams of the semi-circular sleeve structure used for connection of the outer positioning sleeve in Embodiment 1 of this utility model;

[0031] Figure 9 This is the second schematic diagram of the semi-circular sleeve structure used for connection of the outer positioning sleeve in Embodiment 1 of this utility model;

[0032] In the picture:

[0033] 1. Anti-jamming device; 11. Outer positioning sleeve; 111. Outer guide groove; 112. Positioning plate; 113. Mounting surface; 114. Long slot hole; 115. Positioning surface; 12. Inner guide sleeve; 121. Inner guide groove; 122. Positioning ring; 123. Locking sleeve; 124. Guide part;

[0034] 2. Wheel set; 3. Wire harness conveying device; 31. Conveying chamber; 4. Base frame; 5. Motor. Detailed Implementation

[0035] Example 1

[0036] like Figures 1-9 As shown, the bridge anti-jamming steel strand threading machine of this utility model includes:

[0037] The base frame 4 is connected to the motor 5 and the wire harness conveying device 3. The motor 5 is connected to the base frame 4 by bolts.

[0038] The wire harness conveying device 3 is used to convey steel strands. The input end of the wire harness conveying device 3 is connected to the output end of the motor 5. The output end of the wire harness conveying device 3 is provided with several wheel sets 2. The wheel sets 2 include pressure rollers arranged vertically and vertically. The steel strands are conveyed between the two pressure rollers arranged vertically and vertically.

[0039] An anti-jamming device 1 is installed along the travel path of the steel strand. The anti-jamming device 1 includes:

[0040] The outer positioning sleeve 11 is connected to the wire harness conveying device 3, and is correspondingly set on the travel path of the steel strand, with an outer guide groove 111 opened on the corresponding pressure roller;

[0041] The inner guide sleeve 12 is coaxially connected to the inside of the outer positioning sleeve 11. The inner guide groove 121 is provided corresponding to the pressure roller. The inner guide groove 121 is located on the side of the cable outlet end of the guide wheel assembly and is provided with a guide part 124. The guide part 124 extends into the outer guide groove 111. The outer guide groove 111 can restrict the rotation of the inner guide sleeve 12 through the guide part 124.

[0042] The guide portion 124 is an arc-shaped plate connected to the groove at one end of the inner guide groove 121, thus forming a cone-shaped guide structure to guide the steel strand. Here, a cutting machine is used to cut a square opening in the inner guide sleeve 12, while continuing to cut towards one end. After cutting, a V-shaped groove is cut along the connection between the guide portion 124 and the inner guide sleeve 12. The guide portion 124 is then bent outwards to form a certain angle before welding, thus forming a cone-shaped guide structure. Figure 7 The structure at guide section 124 shown.

[0043] The outer positioning sleeve 11 is a split design, which consists of two semi-circular sleeves after being split.

[0044] The outer positioning sleeve 11 is a semi-circular sleeve that is connected to the wire harness conveying device 3. The outer positioning sleeve 11 is abutted against the wire harness conveying device 3 through the positioning surface 115. The positioning surface 115 is used to stably connect the outer positioning sleeve 11 and form an installation reference, ensuring the accuracy of the installation position.

[0045] The semicircular sleeve has a mounting surface 113 on its inner side opposite to the positioning surface 115. The mounting surface 113 has a number of elongated slots 114. The mounting surface 113 is used to ensure the stability when the screw is connected. After the screw is connected to the elongated slots 114, the axial position of the semicircular sleeve can be adjusted.

[0046] The outer positioning sleeve 11 has positioning plates 112 on both sides. The inner guide sleeve 12 has a positioning ring 122 on one side and a locking sleeve 123 on the other side. The positioning ring 122 and the locking sleeve 123 abut against the positioning plates 112 on both sides respectively. The positioning ring 122 is an iron ring welded to the outer ring of the inner guide sleeve 12 and is used for axial positioning, which is achieved in conjunction with the locking sleeve 123.

[0047] The positioning ring 122 is arranged at one end of the outlet side of the inner guide sleeve 12. During the process of pushing the steel strand, the positioning ring 122 is firmly pressed against the positioning plate 112. If the locking sleeve 123 is used, it is easy to loosen over time.

[0048] The wire harness conveying device 3 is located at the position of the wheel set 2 and has a separate conveying cavity 31. The outer positioning sleeve 11 is set in the conveying cavity 31, and the inner guide sleeve 12 extends out of the conveying cavity 31 at both ends.

[0049] Working principle:

[0050] Overall push principle:

[0051] The basic working principle of the equipment is similar to that of existing technologies. The motor 5 serves as the power source, transmitting power to multiple sets of rollers 2 through a reducer and chain / gear transmission (included within the wire harness conveying device 3). The upper and lower corresponding pressure rollers rotate synchronously at low speed and high torque, relying on strong friction to clamp the steel strand and continuously push it forward along a predetermined path.

[0052] Core anti-jamming principle:

[0053] The key is that after the head of the steel strand enters the inner guide sleeve 12, it moves along the inside of the inner guide sleeve 12. During the movement, the guide part 124 is used for guidance to avoid getting stuck on the edge.

[0054] Passive guidance replaces active alignment: In traditional equipment, due to the obstruction of the safety housing, the operator cannot accurately align the wire, and the head of the steel strand will directly hit the sharp edge of the outlet. However, the inner guide sleeve 12 of this utility model has a guide portion 124 on the outlet side forming a flared or conical guide surface that is wider inside and narrower outside.

[0055] Automatic centering and smooth transition: When the off-center steel strand head comes into contact with the inner wall of this wide guide section 124, it will not be stuck. Instead, under the action of the conical surface, it will passively and smoothly slide towards the center and eventually be automatically corrected to the center line of the inner guide sleeve 12, thus passing through without obstruction.

[0056] Stable and reliable structural guarantee: The outer positioning sleeve 11 is firmly connected to the wire harness conveying device 3, providing a stable and coaxial mounting base for the inner guide sleeve 12. The structure of the guide part 124 extending to the outer guide groove 111, as well as the axial limiting of the positioning ring 122 and the locking sleeve 123, ensures that the inner guide sleeve will not rotate or move when subjected to the impact of the steel strand, thus guaranteeing the continuous reliability of the guiding function.

[0057] This device also includes:

[0058] The following content describes existing technical methods for ease of understanding.

[0059] Motor 5: Typically a three-phase AC asynchronous motor, with power ranging from several kilowatts to tens of kilowatts depending on the equipment's design capacity. The motor is responsible for converting electrical energy into mechanical energy (rotational motion). To adapt to the complex power supply environment at construction sites, the motor usually requires good overload capacity and protection ratings (such as IP54 or IP55) for dust and water resistance.

[0060] Control box: Placed sideways for use, it integrates a starter, contactor, thermal relay (overload protection), circuit breaker, and forward / reverse control switch. Operators control the motor's operation via buttons on the control box (such as "Start," "Stop," "Forward," and "Reverse"). More advanced models may be equipped with a frequency converter for soft starting and stepless speed regulation, which is highly beneficial for protecting the steel strands and handling complex operating conditions.

[0061] The wire harness delivery device 3 includes:

[0062] Reducer: This is the core of the transmission system. It is a gearbox that achieves significant speed reduction and torque increase through multi-stage gear meshing. Common types include cycloidal pinwheel reducers or hardened gear reducers. The reduction ratio is very large, usually in the tens to one ratio or even higher, to ensure that there is sufficient torque at the output end to drive the pressure roller to clamp and push the heavy steel strand.

[0063] Chain or gear drive: Chain drive or direct gear drive is usually used between the output shaft of the reducer and the pressure roller assembly.

[0064] Chain drive: It has a simple structure, low cost, and can adapt to changes in center distance. It is often used to distribute power to the upper and lower rows of pressure rollers.

[0065] Gear transmission: smooth transmission, high precision, long service life, often used for synchronous transmission between pressure rollers to ensure that the speed of the upper and lower rollers or the front and rear roller groups is strictly consistent.

[0066] Body / box: Usually a robust welded or cast steel plate structure, it serves as the mounting platform for all conveying components and needs to have sufficient rigidity and strength to withstand the enormous clamping and pushing forces.

[0067] Wheelset: This is the soul of the conveyor system.

[0068] Structure: It typically consists of 2 to 4 pairs (or even more) of pressure rollers arranged vertically. Each pair of pressure rollers forms a clamping point.

[0069] Pressure rollers: The surface of the rollers is usually engraved with V-grooves or patterned arc grooves to increase the contact area and friction with the steel strands, while also providing a certain guiding function to prevent the steel strands from sliding left and right. In order to provide sufficient friction while reducing damage to the steel strands, the pressure rollers of high-end models may be made of highly wear-resistant polyurethane materials or alloy steel with special heat treatment (such as high-frequency quenching).

[0070] Clamping Mechanism: The upper pressure roller is usually movable, applying downward pressure via a spring, cylinder, or manual screw mechanism. The operator can adjust this pressure to accommodate different diameter steel strands or varying pushing resistance. Spring clamping is simple in structure, but the pressure is not easily adjusted precisely; screw clamping offers precise adjustment, but is slightly slower; pneumatic clamping, on the other hand, can apply pressure quickly and evenly.

[0071] Synchronous drive: All pressure rollers (or at least the driving rollers of each pair) are connected by a transmission system and rotate at the exact same linear speed, ensuring that the steel strand is pushed smoothly and synchronously, rather than being torn.

[0072] The descriptions of the orientation and relative positional relationships of the structure in this utility model, such as descriptions of front, back, left, right, up, and down, do not constitute a limitation on this utility model, but are merely for the convenience of description.

Claims

1. A bridge anti-jamming steel strand threading machine, comprising: The base frame (4) is connected to a motor (5) and a wire harness conveying device (3). The wire harness conveying device (3) is used to convey steel strands. The input end of the wire harness conveying device (3) is connected to the output end of the motor (5). The output end of the wire harness conveying device (3) is provided with several wheel sets (2). The wheel sets (2) include pressure rollers arranged vertically and vertically. The steel strands are conveyed between the two pressure rollers arranged vertically and vertically. The feature is that an anti-jamming device (1) is provided on the travel path of the steel strand, and the anti-jamming device (1) includes: The outer positioning sleeve (11) is connected to the wire harness conveying device (3), and is set on the travel path of the steel strand and the corresponding pressure roller is provided with an outer guide groove (111). The inner guide sleeve (12) is coaxially connected to the inside of the outer positioning sleeve (11). The inner guide groove (121) is provided on the corresponding pressure roller. The inner guide groove (121) is located on the side of the cable outlet of the guide wheel assembly and is provided with a guide part (124). The guide part (124) extends into the outer guide groove (111). The outer guide groove (111) can restrict the rotation of the inner guide sleeve (12) through the guide part (124).

2. The anti-wire binding steel strand threading machine for a bridge according to claim 1, characterized in that, The outer positioning sleeve (11) is a split design, which consists of two semi-circular sleeves after splitting.

3. The anti-wire binding steel strand threading machine for a bridge according to claim 2, characterized in that, The outer positioning sleeve (11) is a semi-circular sleeve for connecting to the wire harness conveying device (3) and has a positioning surface (115). The outer positioning sleeve (11) is connected to the wire harness conveying device (3) through the positioning surface (115).

4. The anti-wire binding steel strand threading machine for a bridge according to claim 3, characterized in that, The semi-circular sleeve has an mounting surface (113) on its inner side opposite to the positioning surface (115), and a number of long slots (114) are provided on the mounting surface (113).

5. The anti-jamming steel strand threading machine for bridges according to claim 1, characterized in that, The outer positioning sleeve (11) has positioning plates (112) on both sides, and the inner guide sleeve (12) has a positioning ring (122) on one side and a locking sleeve (123) on the other side. The positioning ring (122) and the locking sleeve (123) abut against the positioning plates (112) on both sides respectively.

6. The anti-wire binding steel strand threading machine for a bridge according to claim 1, characterized in that, The wire harness conveying device (3) is located at the position of the wheel group (2) and has a separate conveying cavity (31). The outer positioning sleeve (11) is set in the conveying cavity (31), and the inner guide sleeve (12) extends out of the conveying cavity (31) at both ends.

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