A screw thread straightening tool

Abstract

This utility model belongs to the field of screw thread repair technology, specifically disclosing a screw thread correction fixture, including a base plate, a driving mechanism on the base plate, a repair cutter roller on the output end of the driving mechanism, and a clamping mechanism slidably mounted on the base plate. The clamping mechanism includes a slide block slidably mounted on the base plate, a clamping seat on the slide block, and a clamping plate slidably mounted on the slide block. An electric push rod is provided on one side of the slide block, and the electric push rod's drive rod is connected to the clamping plate. A through hole is provided on the clamping plate. The clamping seat includes a fixing rod mounted on the slide block, and a clamping surface is provided on one side of the fixing rod. By adopting an inwardly concave arc surface structure for the clamping surface of the clamping seat, a large area of ​​contact is formed with the outer arc surface of the arc-shaped screw head. Combined with the bidirectional clamping of the clamping plate, the radial and axial movement space of the screw is reduced, the probability of screw misalignment during the correction process is reduced, and the fixing stability is improved.

Description

Technical Field

[0001] This utility model belongs to the field of screw thread repair technology, and specifically relates to a screw thread correction tool. Background Technology

[0002] Screw threads are prone to wear and deformation during transportation, installation, or long-term use. Direct replacement would increase costs. Therefore, thread correction using specialized tooling has become an important means of improving screw reuse rate. The fixing stability and correction accuracy of the tooling are the core to ensuring the repair effect.

[0003] Currently, a basic technical system has been formed for screw thread correction fixtures. These fixtures fix screws with clamping structures to provide stable support for subsequent thread repair and have shown practical value in the correction of conventional flat-end screws. However, when dealing with screws with curved surfaces, the design limitations of existing fixtures gradually become apparent. The core problem stems from the insufficient compatibility between the clamping structure and curved screws.

[0004] Existing tooling often uses standardized flat or universal clamping surfaces for its clamping components. When these surfaces come into contact with the curved surface of the screw, they are difficult to fully fit, resulting in poor fixing. During thread correction, the correction force applied by the tool can easily cause slight displacement of the screw, or even slippage. This can lead to deviation of the thread correction trajectory, affecting the accuracy of the repaired thread and potentially leaving additional scratches on the screw surface, reducing its performance. Furthermore, to control slippage, operators often need to adjust the clamping force, which increases the complexity of the operation and may damage the curved surface of the screw due to improper force control. These compatibility issues hinder the efficient and accurate correction of curved screws and need to be improved through structural optimization. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a screw thread correction tool.

[0006] To achieve the above objectives, this utility model provides a screw thread correction tooling, including a base plate, a drive mechanism on the base plate, a repair cutter roller on the output end of the drive mechanism, and a clamping mechanism slidably mounted on the base plate. The clamping mechanism includes a slide seat slidably disposed on a base plate, a clamping seat disposed on the slide seat, and a clamping plate slidably mounted on the slide seat.

[0007] In the above technical solution, an electric push rod is further provided on one side of the slide, and the electric push rod drive rod is connected to the clamping plate.

[0008] In the above technical solution, the clamping plate is further provided with perforations.

[0009] In the above technical solution, the clamping seat further includes a fixing rod disposed on the slide, and a clamping surface is provided on one side of the fixing rod.

[0010] In the above technical solution, the clamping surface is further configured as a concave arc surface structure.

[0011] In the above technical solution, the fixing rod is further provided with an abutment rod, and an adapter block is provided on one side of the abutment rod, and the adapter block is adapted to the groove shape of the screw head.

[0012] In the above technical solution, the abutting rod is further rotatably installed inside the fixed rod.

[0013] In the above technical solution, the other side of the abutment rod is provided with uniformly distributed elastic blocks, and the inner wall of the fixing rod is provided with uniformly distributed sliding grooves that are adapted to the shape of the elastic blocks.

[0014] In the above technical solution, the elastic block is further configured as an elastic structure.

[0015] In the above technical solution, the drive mechanism is further provided with a guide rod, and the guide rod is inserted into a slide block and slidably installed, and a return spring is sleeved on the outside of the guide rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects: By adopting an inwardly concave arc surface structure for the clamping surface of the clamping seat, a large area of ​​contact is formed with the outer arc surface of the arc screw head. Combined with the bidirectional clamping of the clamping plate, the radial and axial movement space of the screw is reduced, the probability of screw displacement during the correction process is reduced, and the fixing stability is improved. By adapting the plug to the slotted shape of the screw head, the screw is precisely guided and positioned. The non-arc surface of the slotted head also increases the friction of the fit, further improving the anti-slip effect and ensuring the accuracy of thread correction. With the rotatable design of the abutment rod, combined with the elastic locking effect of the elastic block, the abutment rod can rotate synchronously when the screw slips, avoiding hard damage to the grooving of the screw head. The elastic block balances clamping stability and protection through flexible locking force, reducing the risk of damage to the grooving of the screw head during the process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a part of this utility model; Figure 2 This is a schematic diagram of the clamping mechanism proposed in this utility model; Figure 3 This is a schematic diagram of the sliding structure of the clamping plate proposed in this utility model; Figure 4 This is a schematic diagram of the internal structure of the abutment rod proposed in this utility model; Figure 5 This is a schematic diagram of the abutment rod structure proposed in this utility model.

[0018] In the diagram: 1. Base plate; 2. Drive mechanism; 3. Repair cutter roller; 4. Clamping mechanism; 41. Slide; 42. Electric push rod; 43. Clamping plate; 44. Clamping seat; 441. Fixing rod; 442. Abutting rod; 443. Clamping surface; 444. Elastic block; 445. Adaptor block; 45. Guide rod; 46. Return spring. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Example like Figures 1-5 The screw thread correction fixture shown includes a base plate 1, which serves as the overall mounting foundation. The base plate 1 provides a stable support platform for each functional component, ensuring that the fixture does not easily shake during operation. A drive mechanism 2 is installed on the base plate 1, which serves as a power output source. A repair cutter roller 3 is installed at its output end. The drive mechanism 2 drives the repair cutter roller 3 to rotate at high speed, enabling the repair cutter roller 3 to form a cutting fit with the thread surface of the screw, thereby realizing the correction of damaged threads. To achieve precise alignment between the screw and the repair cutter roller 3, a clamping mechanism 4 is also slidably installed on the base plate 1. The clamping mechanism 4 can move along the horizontal direction of the base plate 1, and by adjusting its own position, it can move the screw closer to or away from the repair cutter roller 3, providing a suitable working position for thread correction.

[0021] The clamping mechanism 4 includes a slide block 41 slidably mounted on the base plate 1. The slide block 41 serves as the main support of the clamping mechanism 4 and integrates the core components for fixing screws. A clamping seat 44 is provided on the slide block 41, and a clamping plate 43 is also slidably mounted on the slide block 41. The clamping seat 44 and the clamping plate 43 are arranged opposite to each other to form a clamping structure for the screw head. An electric push rod 42 is provided on one side of the slide block 41, and the drive rod of the electric push rod 42 is connected to the clamping plate 43. The electric push rod 42 can provide a stable linear driving force. The extension and retraction of the electric push rod 42 drives the clamping plate 43 to slide along the slide block 41, thereby adjusting the distance between the clamping plate 43 and the clamping seat 44 to accommodate curved screws of different sizes. A through hole is provided on the clamping plate 43. The diameter of the through hole is adapted to the size of the screw shank. When the clamping plate 43 moves towards the clamping seat 44, the screw shank can pass through the through hole, so that the clamping plate 43 can accurately abut against the end face of the screw head and avoid the clamping position from shifting.

[0022] The clamp 44 includes a fixing rod 441 mounted on the slide 41. The fixing rod 441 is the main structural component of the clamp 44, and a clamping surface 443 is provided on one side. The clamping surface 443 is a concave arc surface structure. The curvature of this concave arc surface matches the outer arc surface of the arc screw head. Based on this structural adaptability, when the screw head is placed into the clamping surface 443, a larger contact area can be formed. Compared with the existing planar clamping surface, the clamping gap is effectively reduced, thereby achieving the initial clamping and limiting of the arc screw. To reduce the probability of radial displacement of the screw during subsequent correction, an abutment rod 442 is provided inside the fixing rod 441. An adapter block 445 is provided on one side of the abutment rod 442, and the adapter block 445 is adapted to the groove shape of the screw head. When the screw is placed on the clamp 44, the adapter block 445 can be inserted into the groove of the screw head. The screw is guided and positioned by the shape adaptation to ensure that the central axis of the screw is parallel to the central axis of the repair cutter roller 3, thus providing a basic guarantee for the accuracy of thread correction.

[0023] The abutment rod 442 is rotatably mounted inside the fixed rod 441. This rotatable design allows the abutment rod 442 to move synchronously with the rotation of the screw. When the screw slips slightly during thread trimming, the abutment rod 442 can avoid rigid friction with the screw head slot by rotating itself, thereby reducing damage to the head slot surface. The other side of the abutment rod 442 is provided with evenly distributed elastic blocks 444. The inner wall of the fixed rod 441 has evenly distributed grooves that fit the shape of the elastic blocks 444. The elastic blocks 444 are designed as elastic structures. 44 is embedded in the groove and in close contact with the inner wall of the groove. Through the elastic deformation of the elastic block 444, a certain radial locking force can be provided to the abutment rod 442. This locking force can improve the tightness of the fit between the abutment rod 442 and the groove of the screw head, and further enhance the clamping effect of the screw. When the rotational force on the screw exceeds the locking threshold of the elastic block 444, the elastic block 444 will undergo compression deformation, allowing the abutment rod 442 to rotate synchronously with the screw, avoiding squeezing damage to the groove of the screw head due to excessive locking force, and realizing flexible control of clamping force.

[0024] A guide rod 45 is provided on the drive mechanism 2, and the guide rod 45 is inserted into and slidably installed on the slide block 41. The axis of the guide rod 45 is consistent with the sliding direction of the slide block 41, providing precise guidance for the movement of the slide block 41 and preventing the slide block 41 from deviating during the sliding process. This ensures that the screw can stably approach the repair cutter roller 3. A return spring 46 is sleeved on the outside of the guide rod 45. When the slide block 41 moves towards the drive mechanism 2, the return spring 46 is compressed and stores elastic potential energy. When the thread correction operation is completed, the operator releases the constraint on the slide block 41, and the return spring 46 releases the elastic potential energy, pushing the slide block 41 to automatically return to the initial position, preparing for the next operation and simplifying the operation process.

[0025] In use, the repair cutter roller 3 is driven by the drive mechanism 2 to rotate, reaching the speed required for thread correction. The screw head to be repaired is then placed into the clamping surface 443 within the clamping seat 44. The concave arc surface of the screw head and the outer arc surface of the screw form initial clamping and limiting, reducing the radial movement space of the screw. Subsequently, the slotted screw head engages with the adapter block 445. The shape of the adapter block 445 guides the screw's central axis to align with the repair cutter roller 3, providing a foundation for precise correction. Next, the electric push rod 42 drives the clamping plate 43 to move towards the clamping seat 44, allowing the screw shank to pass through the hole in the clamping plate 43. The clamping plate 43 presses tightly against the other side of the screw head, forming a bidirectional stable clamping with the clamping seat 44, preventing axial displacement of the screw. Simultaneously, the tight engagement of the adapter block 445 with the slotted screw head, due to the non-arc surface of the slot, generates greater friction with the adapter block 445, effectively improving the anti-slip effect. This, combined with the clamping seat... The clamping action of the 44 and the clamping plate 43 further fixes the screw, making the overall clamping effect more stable. Then, the slide block 41 is pushed along the guide rod 45 towards the repair cutter roller 3 until the damaged thread contacts the repair cutter roller 3. The repair cutter roller 3 cuts and corrects the thread. During this process, if the screw slips slightly, the abutment rod 442 can rotate independently of the fixing rod 441. Therefore, the abutment rod 442 can rotate synchronously with the head slot of the screw, avoiding hard damage to the head slot. At the same time, the abutment rod 442 forms an elastic abutment with the inner wall of the fixing rod 441 through the elastic block 444 of the elastic structure, providing a certain locking force for the abutment rod 442 and improving the clamping effect of the screw. When the force on the screw exceeds the threshold, the elastic block 444 can deform, allowing the abutment rod 442 to rotate, avoiding further damage to the head slot of the screw. After the thread correction is completed, the slide block 41 automatically resets under the action of the return spring 46, and the electric push rod 42 drives the clamping plate 43 to retract, so that the operator can take out the repaired screw.

[0026] The beneficial effects of this embodiment: Because the clamping surface 443 of the clamping seat 44 adopts an inwardly concave arc surface structure, it forms a large area of ​​contact with the outer arc surface of the arc surface screw head. Combined with the bidirectional clamping of the clamping plate 43, it reduces the radial and axial movement space of the screw, reduces the probability of screw displacement during the correction process, and improves the fixing stability. Because the 445 adapter plug is compatible with the slotted shape of the screw head, it not only achieves precise guiding and positioning of the screw, but also increases the contact friction by utilizing the non-arc surface structure of the slotted head, further improving the anti-slip effect and ensuring the accuracy of thread correction. With the rotatable design of the abutment rod 442 and the elastic locking effect of the elastic block 444, the abutment rod 442 can rotate synchronously when the screw slips to avoid hard damage to the screw head slot. The elastic block 444 balances clamping stability and protection through flexible locking force, reducing the risk of screw head slot damage during the process.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A screw product thread modification tool characterized by, Includes a base plate (1), on which a drive mechanism (2) is provided, and a repair cutter roller (3) is provided on the output end of the drive mechanism (2). A clamping mechanism (4) is also slidably installed on the base plate (1). The clamping mechanism (4) includes a slide (41) slidably disposed on the base plate (1), a clamp (44) is disposed on the slide (41), and a clamping plate (43) is slidably mounted on the slide (41).

2. A screw product thread correction tool according to claim 1, wherein: An electric push rod (42) is provided on one side of the slide (41), and the drive rod of the electric push rod (42) is connected to the clamp (43).

3. A screw thread modification tool as claimed in claim 1, wherein: The clamp (43) has perforations.

4. The screw thread straightening fixture according to claim 1, characterized in that: The clamp (44) includes a fixing rod (441) disposed on the slide (41), and a clamping surface (443) is provided on one side of the fixing rod (441).

5. A screw thread straightening fixture according to claim 4, characterized in that: The clamping surface (443) is configured as a concave arc surface structure.

6. A screw thread straightening fixture according to claim 4, characterized in that: The fixing rod (441) is provided with an abutment rod (442), and an adapter block (445) is provided on one side of the abutment rod (442), and the adapter block (445) is adapted to the groove shape of the screw head.

7. A screw thread straightening fixture according to claim 6, characterized in that: The abutment rod (442) is rotatably mounted inside the fixed rod (441).

8. A screw thread straightening fixture according to claim 6, characterized in that: The other side of the abutment rod (442) is provided with uniformly distributed elastic blocks (444), and the inner wall of the fixing rod (441) is provided with uniformly distributed sliding grooves that are adapted to the shape of the elastic blocks (444).

9. A screw thread straightening fixture according to claim 8, characterized in that: The elastic block (444) is configured as an elastic structure.

10. A screw thread straightening fixture according to claim 1, characterized in that: The drive mechanism (2) is provided with a guide rod (45), and the guide rod (45) is inserted into the slide block (41) and slidably installed. A return spring (46) is sleeved on the outside of the guide rod (45).

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