Screw tapping device

Abstract

The utility model relates to the technical field of machining, in particular to a device for screw tapping. Comprising an inverted-U-shaped support, the upper end of the support is in threaded connection with an adjusting bolt, an inverted-L-shaped supporting arm is fixed to the front side of the support, a fixing rod is fixed to the supporting arm, a sliding rod is arranged on the fixing rod in a sliding mode, a motor is fixed to the rear end of the sliding rod, a chuck is fixed to an output shaft of the motor, a screw tap is clamped and fixed to the chuck, and a driving assembly is installed on the sliding rod. The driving assembly can drive the sliding rod to move, and a positioning assembly is arranged at the front end of the support. When punching or tapping is carried out on the cross brace of the frame, the support is located on the outer side of the cross brace of the frame, the position of the device in the length direction of the cross brace can be adjusted by moving the support, the adjusting bolt is rotated, and the height of the device can be adjusted by continuously rotating the adjusting bolt after the adjusting bolt makes contact with the upper end of the cross brace. And therefore, the screw tap can conveniently correspond to the hole in the cross brace.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically to a device for tapping screws. Background Technology

[0002] In the field of mechanical manufacturing, frame structures (such as hydraulic stations, equipment bases, etc.) are often formed by welding steel sections or plates. Existing processes usually follow the "machine holes first, then weld" procedure: that is, threaded holes are pre-drilled and tapped on a single piece of material, and internal parts (such as hydraulic valve blocks, motor brackets, etc.) are installed through the threaded holes after the frame is welded.

[0003] However, this process has the following technical defects: 1. Welding deformation leads to hole misalignment. The thermal stress during welding causes the frame to shrink and bend (deformation can reach 0.5-3mm), resulting in a systematic deviation between the actual spatial position of the pre-machined threaded holes and the design coordinates. Taking a hydraulic station as an example, when the diagonal error of the welded frame exceeds 2mm, more than 40% of the valve assembly mounting holes will be misaligned; 2. Error superposition effect. The machining tolerance (±0.1mm), welding assembly error (±0.5mm), and thermal deformation error of a single part have a superposition effect. Experimental data shows that the cumulative error of the threaded holes in the hexahedral frame can reach 1 / 200 of the design spacing, resulting in a misalignment rate of up to 32% for threaded holes of M12 and above.

[0004] The aforementioned defects lead to widespread pain points in the manufacturing industry, including high rework rates (approximately 17% rework rate for hydraulic station frames), redundant parts inventory (requiring the stocking of 3%-5% of adjusting shims), and low installation efficiency (increasing installation time for individual parts by 2-3 times). Therefore, there is an urgent need to develop a new device that can adapt to welding deformation and achieve in-situ tapping of the entire frame.

[0005] Patent document CN218426037U discloses a tapping device for screw processing, including a base, a worktable mounted on the top of the base by a support column, a lifting plate installed inside the worktable, a hydraulic rod mounted on the bottom of the lifting plate, the hydraulic rod mounted on the top of the base, a fixing plate mounted on the top of the lifting plate, a threaded rod installed inside the fixing plate, a clamping plate installed at the front end of the threaded rod, a drain hole provided at the top of the lifting plate, and a baffle mounted on the top surface, a drilling machine mounted on the top of the worktable, a connecting ring mounted on the side of the drilling machine, a water pipe installed inside the connecting ring, and a drain pipe installed at the bottom of the lifting plate. Existing tapping devices require clamping the object to be tapped; however, when the overall frame is large, existing tapping devices cannot clamp it for tapping operations.

[0006] When installing parts on a hydraulic station frame, screws are prone to breakage when subjected to high torque. The existing solution is to drill a hole in the broken screw and tap the thread in reverse, then connect a new bolt to the threaded hole of the broken screw, and rotate the new bolt to remove the broken screw. However, drilling and tapping the broken screw makes positioning difficult and can easily damage the threaded hole. Utility Model Content

[0007] The main purpose of this invention is to provide a device that can facilitate tapping operations on large frames, improve tapping accuracy and efficiency, and facilitate the removal of broken wires.

[0008] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0009] A device for tapping screws includes a bracket in the shape of an inverted U. An adjusting bolt is threaded to the upper end of the bracket. An inverted L-shaped support arm is fixed to the front side of the bracket. A fixing rod is fixed to the support arm. A slide rod is slidably mounted on the fixing rod. A motor is fixed to the rear end of the slide rod. A chuck is fixed to the output shaft of the motor. A tap is clamped and fixed on the chuck. A drive assembly is mounted on the slide rod. The drive assembly can drive the slide rod to move. A positioning assembly is provided at the front end of the bracket.

[0010] Specifically, the fixed rod has a circular hole, the sliding rod is a circular rod, and the sliding rod is slidably disposed in the circular hole. The driving assembly includes a rack, which is fixed on the sliding rod. The fixed rod has a long groove communicating with the circular hole. The cross-section of the long groove is rectangular. The rack is slidably engaged in the long groove. A connecting groove communicating with the long groove is provided on the outside of the fixed rod. Ear plates are fixed on the fixed rod on both the upper and lower sides of the connecting groove. A gear is rotatably connected between the two ear plates. Part of the teeth of the gear passes through the connecting groove and meshes with part of the teeth of the rack. A wheel axle is concentrically fixed on the gear, and a handwheel is concentrically fixed on the wheel axle.

[0011] Specifically, the fixed rod is arranged longitudinally, the axial direction of the sliding rod is parallel to the length direction of the fixed rod, and the length direction of the long groove is parallel to the length direction of the sliding rod.

[0012] Specifically, multiple omnidirectional balls are installed on the lower side of the upper end of the bracket.

[0013] Specifically, the positioning component includes a fastening bolt, which is threaded onto the front side of the bracket.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. When drilling or tapping on the cross brace of the frame, the bracket is positioned outside the cross brace of the frame. Moving the bracket can adjust the position of the device in the length direction of the cross brace. Rotating the adjusting bolt until it contacts the upper end of the cross brace can adjust the height of the device, thus facilitating the alignment of the tap with the hole on the cross brace and making tapping operations easier. The device has good stability during tapping and can improve the tapping quality.

[0016] 2. This allows drilling operations to be performed on the cross braces of the frame after replacing the tap with a drill bit. The drilling process offers good stability and improves drilling quality.

[0017] 3. By setting up a swivel ball, the device can be easily moved on the cross brace after the swivel ball contacts the cross brace, making it more convenient to move the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the device being installed on the cross brace of the frame.

[0019] Figure 2 for Figure 1 A magnified view of region A in the middle.

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the fixed rod.

[0021] Figure 4 This is a schematic diagram of the connecting groove on the fixed rod.

[0022] The components in the attached diagram are named as follows: 1. Bracket, 2. Adjusting bolt, 3. Ball joint, 4. Fastening bolt, 5. Support arm, 6. Fixing rod, 7. Slide rod, 8. Rack, 9. Ear plate, 10. Gear, 11. Handwheel, 12. Motor, 13. Chuck, 14. Tap, 15. Round hole, 16. Long slot, 17. Connecting slot. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Example 1: Refer to Figures 1-4 As shown, a device for tapping screws includes a bracket 1, which is inverted U-shaped. An adjusting bolt 2 is threaded to the upper end of the bracket 1. An inverted L-shaped support arm 5 is fixed to the front side of the bracket 1, and a fixing rod 6 is fixed to the support arm 5. A sliding rod 7 is slidably mounted on the fixing rod 6. Specifically, a circular hole 15 is formed in the fixing rod 6, and the sliding rod 7 is a round rod that slidably fits within the circular hole 15. The fixing rod 6 is arranged longitudinally, and the axial direction of the sliding rod 7 is parallel to the length direction of the fixing rod 6.

[0025] A motor 12 is fixed to the rear end of the slide rod 7. A chuck 13 is fixed to the output shaft of the motor 12. A tap 14 is clamped and fixed on the chuck 13. A drive assembly is installed on the slide rod 7. The drive assembly can drive the slide rod 7 to move.

[0026] The drive assembly includes a rack 8, which is fixed on a slide rod 7. A long groove 16 communicating with a circular hole 15 is provided on the fixed rod 6. The cross-section of the long groove 16 is rectangular, and the length direction of the long groove 16 is parallel to the length direction of the slide rod 7. The rack 8 is slidably engaged in the long groove 16.

[0027] A connecting groove 17 is provided on the outer side of the fixed rod 6, which is connected to the long groove 16. Ear plates 9 are fixed on the fixed rod 6 on both the upper and lower sides of the connecting groove 17. A gear 10 is rotatably connected between the two ear plates 9. Some teeth of the gear 10 pass through the connecting groove 17 and mesh with some teeth of the rack 8.

[0028] A wheel axle is concentrically fixed to the gear 10, and a handwheel 11 is concentrically fixed to the wheel axle.

[0029] A positioning component is provided at the front end of the bracket 1. The positioning component includes a fastening bolt 4, which is threadedly connected to the front side of the bracket 1.

[0030] When drilling is required on the cross brace of the frame, the drill bit replaces the tap 14 on the chuck 13. The bracket 1 is then installed on the outside of the cross brace. The device is moved so that the drill bit aligns vertically with the position where the hole needs to be drilled. Then, the adjusting bolt 2 is rotated. After the adjusting bolt 2 contacts the upper end of the cross brace, the adjusting bolt 2 is rotated to adjust the height of the device. When the drill bit is concentric with the position where the hole needs to be drilled, the fastening bolt 4 is rotated. After the fastening bolt 4 is pressed tightly against the cross brace, the bracket 1 is fixed on the cross brace. The motor 12 is started, and the motor 12 drives the chuck 13 and the drill bit to rotate. The handwheel 11 is rotated, and under the meshing action of the gear 10 and the rack 8, the slide rod 7, the motor 12, the chuck 13, and the drill bit move towards the cross brace. After the rotating drill bit contacts the cross brace, it can drill a hole in the cross brace.

[0031] After drilling is completed, tap 14 replaces the drill bit on chuck 13. Start motor 12, which drives chuck 13 and tap 14 to rotate. Turn handwheel 11 to move slide bar 7, motor 12, chuck 13 and tap 14 toward cross brace. After the rotating tap 14 enters the hole on cross brace, tapping operation can be performed.

[0032] When it is necessary to remove the broken wire, grind the broken surface of the broken wire flat, use this device to drill a hole in the broken wire, then replace the drill bit on the chuck 13 with a reverse tap, then use the reverse tap to process a reverse thread on the broken wire, then connect the reverse bolt to the threaded hole on the broken wire, and then rotate the reverse bolt counterclockwise to remove the broken wire.

[0033] Example 2: Based on Example 1, referring to... Figure 2 As shown, multiple omnidirectional balls 3 are installed on the lower side of the upper end of the bracket 1.

[0034] After bracket 1 is fitted onto the outside of the cross brace, the ball of universal ball 3 contacts the upper end of the cross brace, making it easier to move the device on the cross brace.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for tapping screws, comprising a bracket (1) in the shape of an inverted U, characterized in that, The upper end of the bracket (1) is threaded with an adjusting bolt (2). The front side of the bracket (1) is fixed with an inverted L-shaped support arm (5). A fixing rod (6) is fixed on the support arm (5). A slide rod (7) is slidably arranged on the fixing rod (6). A motor (12) is fixed at the rear end of the slide rod (7). A chuck (13) is fixed on the output shaft of the motor (12). A tap (14) is clamped and fixed on the chuck (13). A drive assembly is installed on the slide rod (7). The drive assembly can drive the slide rod (7) to move. A positioning assembly is provided at the front end of the bracket (1).

2. The device for tapping screws according to claim 1, characterized in that, The fixed rod (6) has a round hole (15), the slide rod (7) is a round rod, the slide rod (7) is slidably disposed in the round hole (15), the drive assembly includes a rack (8), the rack (8) is fixed on the slide rod (7), the fixed rod (6) has a long groove (16) communicating with the round hole (15), the cross section of the long groove (16) is rectangular, the rack (8) is slidably engaged in the long groove (16), the outside of the fixed rod (6) has a connecting groove (17) communicating with the long groove (16), the fixed rod (6) on both the upper and lower sides of the connecting groove (17) has ear plates (9) fixed on the fixed rod (6), the two ear plates (9) are rotatably connected to a gear (10), some teeth of the gear (10) penetrate the connecting groove (17) and mesh with some teeth of the rack (8), a wheel axle is concentrically fixed on the gear (10), and a handwheel (11) is concentrically fixed on the wheel axle.

3. The device for tapping screws according to claim 2, characterized in that, The fixed rod (6) is arranged longitudinally, the axial direction of the slide rod (7) is parallel to the length direction of the fixed rod (6), and the length direction of the long groove (16) is parallel to the length direction of the slide rod (7).

4. The device for tapping screws according to claim 1, characterized in that, Multiple universal balls (3) are installed on the lower side of the upper end of the bracket (1).

5. The device for tapping screws according to claim 1, characterized in that, The positioning assembly includes a fastening bolt (4), which is threaded onto the front side of the bracket (1).

Images