Screw tap clamping device

Abstract

The invention provides a screw tap clamping device, and belongs to the technical field of fixing clamps. The problem that an existing clamping device is low in clamping precision is solved. The screw tap clamping device comprises a floating disc and a mounting disc, four sliding blocks are connected into the mounting disc in a sliding mode, a clamping opening is formed in the centers of the four sliding blocks, and a fixing bolt penetrates through the floating disc and is arranged in the mounting disc in a penetrating mode in a threaded connection mode so that the floating disc can be connected with the mounting disc. A first adjusting hole and a second adjusting hole are formed in the circumferential edge of the inner side of the mounting disc, a cylindrical spring is arranged in the first adjusting hole in a penetrating mode, a gap is formed between the floating disc and the mounting disc through the cylindrical spring, an adjusting cylinder is fixedly connected in the second adjusting hole in a tightly attached mode, and adjusting columns are fixedly connected to the inner side of the floating disc at equal intervals; and the adjusting columns are inserted into the corresponding adjusting cylinders in a tight fit manner. The screw tap clamping device has the advantages that the clamping precision of the clamping device is improved, and the machining quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fixing fixtures and relates to a tap clamping device. Background Art

[0002] When machining internal threads, large-diameter internal threads can be machined using an internal thread turning tool. However, small-diameter internal threads are difficult to machine using an internal thread turning tool. A hole must be drilled in the workpiece first, and then tapped with a tap to produce the internal thread. During the tapping process, the tap must be secured with a chuck.

[0003] An existing chuck for fixing a tap, for example, a chuck disclosed in Chinese patent literature [patent number: 201710848018.0; application publication number: CN107414215A], includes an intermediate body, an adjusting bolt and a pair of cover plates, the intermediate body has a through and polygonal mounting hole, a plurality of sliders are provided in the mounting hole, a clamping opening is formed between the sliders, the sliders all have inclined surfaces, one of the sliders is recorded as the first slider, the first slider has a clamping groove, the intermediate body also has a threaded hole, the threaded hole is connected to the mounting hole, the adjusting bolt is passed through the threaded hole, the inner end of the adjusting bolt has a clamping portion protruding radially outward along the adjusting bolt, the clamping portion is located in the clamping groove so that the adjusting bolt and the first slider are clamped, a pair of cover plates are respectively fixed to both sides of the intermediate body, the cover plate has a through hole, and the through hole and the clamping opening are correspondingly arranged.

[0004] With this type of chuck, inserting the tail end of the tap into the clamping opening and tightening the adjustment bolt pushes the first slider to move, which then drives the remaining sliders in tandem, clamping the tap. However, this type of chuck must be mounted to the equipment's mounting plate using fixing bolts. The threaded connection inevitably has gaps of several to several dozen threads in the axial and radial directions. This results in a positional deviation of several to several dozen threads after the tap is secured, reducing the tap's fixing accuracy and, consequently, the machining accuracy of the internal thread. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a tap clamping device, the technical problem to be solved is how to improve the clamping accuracy of the clamping device and improve the processing quality.

[0006] The objectives of the present invention can be achieved through the following technical solutions: A tap clamping device includes a floating plate with a square mounting opening in the center, four sliders are slidably connected to the mounting opening, and the centers of the four sliders form a clamping opening of variable size, characterized in that the clamping device also includes a mounting plate, which is connected to the floating plate by a fixing bolt passing through the floating plate and threadedly inserted into the mounting plate, a plurality of first adjustment holes and a plurality of second adjustment holes are evenly spaced on the circumferential edge of the inner side of the mounting plate, a cylindrical spring is passed through the first adjustment hole, and the two ends of the cylindrical spring act on the floating plate and the mounting plate respectively to form a gap between the floating plate and the mounting plate, a cylindrical and elastic adjustment cylinder is tightly fixedly connected to the second adjustment hole, a plurality of adjustment posts are evenly fixedly connected to the inner side of the floating plate, the adjustment posts are tightly inserted into the corresponding adjustment cylinders, a gap is formed between the adjustment cylinder and the floating plate, and a certain distance is formed between the adjustment post and the bottom of the second adjustment hole.

[0007] During installation, the tail end of the tap is inserted into the clamping opening, and the tap is clamped and positioned by the slider. A fixing bolt is threadedly connected to the mounting plate. Under the action of the cylindrical spring, the cylindrical spring pushes the floating plate away from the mounting plate, creating a gap between the floating plate and the mounting plate, allowing the fixing bolt to engage the floating plate, eliminating the axial gap of several to several tens of threads when the fixing bolt and the mounting plate are threaded together. The regular shape of the cylindrical spring stabilizes the position of the floating plate, thereby improving the clamping accuracy of the clamping device. The fixing bolt passes through the floating plate, but the fixing bolt and the floating plate are not fixed or locked, but are flexibly connected. A slight gap of several to several tens of threads is provided between the fixing bolt and the floating plate. The adjustment tube is elastic, meaning that the adjustment tube can deform to a certain extent, tightly fitting the adjustment tube and the adjustment column. This deformation of the adjustment tube causes the floating plate to deflect radially relative to the mounting plate, thereby eliminating the radial gap of several to several tens of threads when the fixing bolt and the mounting plate are threaded together. A gap exists between the adjustment tube and the floating plate, and a certain distance exists between the adjustment post and the bottom of the second adjustment hole. This ensures that the arrangement of the adjustment tube and adjustment post does not affect the axial adjustment of the cylindrical spring. This clamping device, under the action of the cylindrical spring's elastic force, eliminates the axial gap between the fixing bolt and the mounting plate. The deformation of the adjustment tube also eliminates the radial gap between the fixing bolt and the mounting plate, thereby improving the positioning accuracy of the clamping opening, enhancing the clamping precision of the tap, and thus enhancing processing quality. In actual production, this clamping device can also be used to clamp other workpieces.

[0008] In the aforementioned tap clamping device, a plurality of through-holes are provided at equal intervals along the circumferential edge of the floating plate. The inner sidewalls of the through-holes protrude inwardly to form an annular retaining edge. The fixing bolt passes through the retaining edge, and the head of the fixing bolt abuts against the retaining edge under the elastic force of the cylindrical spring. A slight gap, such as a few or several dozen inches, is provided between the fixing bolt and the inner sidewall of the retaining edge. With this structure, the fixing bolts, under the elastic force of the cylindrical spring, position the floating plate and the mounting plate relative to each other, allowing slight relative axial movement between the floating plate and the mounting plate, thereby achieving dynamic equilibrium.

[0009] In the aforementioned tap clamping device, the cylindrical spring and the adjustment cylinder are both arranged axially along the mounting plate, and the adjustment post is arranged axially along the floating plate. This structure improves the positioning accuracy of the cylindrical spring, adjustment cylinder, and adjustment post, thereby enhancing the clamping accuracy of the clamping device and improving processing quality.

[0010] In the aforementioned tap clamping device, disc-shaped washers are provided at both ends of the cylindrical spring, one of which rests against the inner wall of the floating plate, while the other rests against the bottom of the first adjustment hole. The provision of the washers flattens the ends of the cylindrical spring, allowing the spring force of the cylindrical spring to act more axially on the floating plate, thereby effectively eliminating the axial play of several to several tens of threads when the fixing bolt is threadedly connected to the mounting plate.

[0011] In the above-mentioned tap clamping device, the adjusting cylinder is made of a silicone material or a rubber material. The adjusting cylinder made of such a material has sufficient elasticity and strength.

[0012] In the aforementioned tap clamping device, the end surface of the adjustment tube is flush with the inner sidewall of the mounting plate. This structure prevents the adjustment tube from contacting the floating plate while maximizing the contact area between the adjustment tube and the adjustment post, effectively eliminating the radial gap of several to several tens of threads when the fixing bolt is threadedly connected to the mounting plate.

[0013] In the aforementioned tap clamping device, the floating disc has a rotating hole with an annular stepped surface. An adjusting bolt passes through the rotating hole and is threadedly connected to one of the sliders. Rotating the adjusting bolt causes all of the sliders to move along the inner sidewall of the mounting opening, thereby changing the size of the clamping opening. An annular plug is threadedly connected to the rotating hole, with the head of the adjusting bolt located between the stepped surface and the plug. The plug can press the head of the adjusting bolt against the stepped surface, positioning the adjusting bolt axially and allowing it to rotate circumferentially within the rotating hole. A tool is inserted through the plug to rotate the adjusting bolt, thereby driving the slider to move, providing convenient operation.

[0014] In the aforementioned tap clamping device, an adjustment spring is mounted on the outer sleeve of the adjusting bolt. The adjustment spring is located in the mounting opening. One end of the adjustment spring acts on the floating plate, and the other end acts on a slider connected to the adjusting bolt. With this structure, the axial length of the adjusting bolt's head is less than the distance between the stepped surface and the plug. When installing the tap, the spring force of the adjustment spring pushes the slider to clamp the tap, eliminating the need for repeated adjustments. Once adjusted, the device can be reused.

[0015] In the aforementioned tap clamping device, the floating plate has four guide slots, each of which is penetrated by a guide bolt, which is fixedly connected to the corresponding slider. The guide bolts and guide slots guide the movement of the slider, causing it to move in a predetermined direction, thereby improving the positional accuracy of the clamping opening, thereby enhancing the clamping accuracy of the clamping device and improving processing quality.

[0016] In the aforementioned tap clamping device, each slider has a mounting slot, into which a clamping block is removably embedded and fixedly connected, with four clamping blocks forming the clamping opening. The clamping blocks can be made of a specific material, enabling the clamping device to better clamp the tap and workpiece, thereby improving the clamping accuracy of the clamping device.

[0017] Compared with the prior art, the present invention provides a tap clamping device in which the fixing bolt is threadedly connected to the mounting plate, with axial and radial gaps of a few to dozens of threads. Under the action of the elastic force of the cylindrical spring, the axial gap between the fixing bolt and the mounting plate is eliminated. Under the action of the deformation of the adjusting cylinder, the radial gap between the fixing bolt and the mounting plate is eliminated, thereby improving the position accuracy of the clamping port and the clamping accuracy of the tap, thereby improving the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the clamping device.

[0019] Figure 2 It is a structural schematic diagram of the mounting plate of the clamping device.

[0020] Figure 3 It is a structural schematic diagram of the floating plate of the clamping device.

[0021] Figure 4 It is a top view of the clamping device.

[0022] Figure 5 This clamping device Figure 4 AA section view.

[0023] Figure 6 This clamping device Figure 4 BB section view.

[0024] Figure 7 This clamping device Figure 4 CC section view.

[0025] Figure 8 This clamping device Figure 4 DD section view.

[0026] In the figure, 1. Mounting port; 2. Floating plate; 3. Slider; 4. Clamping port; 5. Mounting plate; 6. Fixing bolt; 7. First adjusting hole; 8. Second adjusting hole; 9. Cylindrical spring; 10. Adjusting cylinder; 11. Adjusting column; 12. Through hole; 13. Stop edge; 14. Gasket; 15. Rotating hole; 16. Step surface; 17. Plug; 18. Adjusting spring; 19. Guide groove; 20. Guide bolt; 21. Mounting groove; 22. Clamping block; 23. Adjusting bolt. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0028] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, the clamping device includes a floating plate 2, a slider 3, a mounting plate 5, a fixing bolt 6, a cylindrical spring 9, an adjusting cylinder 10, an adjusting column 11, a gasket 14, a plug 17, an adjusting spring 18, a guide bolt 20 and a clamping block 22.

[0029] like Figure 6 As shown, in this embodiment, four through holes 12 are provided at equal intervals on the circumferential edge of the floating plate 2, and the inner side wall at the middle of the through hole 12 protrudes inward to form an annular retaining edge 13. Four threaded holes are provided at equal intervals on the circumferential edge on the inner side of the mounting plate 5. The rod of the fixing bolt 6 passes through the retaining edge 13 and is threadedly connected to the threaded hole of the mounting plate 5 to connect the floating plate 2 and the mounting plate 5. In actual production, the number of the through holes 12 and the threaded holes can be five or six.

[0030] In this embodiment, four first adjustment holes 7 and four second adjustment holes 8 are provided at equal intervals on the circumferential edge of the inner side of the mounting plate 5. In actual production, the number of the first adjustment holes 7 and the four second adjustment holes 8 can be five or six.

[0031] like Figure 5As shown, a cylindrical spring 9 is inserted into the first adjustment hole 7 and arranged axially along the mounting plate 5. Its two ends act on the floating plate 2 and the mounting plate 5, respectively, creating a gap between them. A disc-shaped gasket 14 is provided at each end of the cylindrical spring 9, one of which rests against the inner wall of the floating plate 2, and the other against the bottom of the first adjustment hole 7. The head of the fixing bolt 6 rests against the retaining edge 13 under the elastic force of the cylindrical spring 9.

[0032] like Figure 7 As shown, a cylindrical, elastic adjustment tube 10 is tightly fixedly attached to the second adjustment hole 8 and arranged axially along the mounting plate 5. Four adjustment posts 11 are evenly spaced and fixedly attached to the inner side of the floating plate 2. The adjustment posts 11 are arranged axially along the floating plate 2 and tightly inserted into their corresponding adjustment tubes 10. The end faces of the adjustment tubes 10 are flush with the inner sidewall of the mounting plate 5, with a gap between the adjustment tube 10 and the floating plate 2, and a certain distance between the adjustment posts 11 and the bottom of the second adjustment hole 8. In this embodiment, the adjustment tubes 10 are made of silicone; in actual production, they are made of rubber.

[0033] The center of the floating plate 2 has a square mounting opening 1, in which four sliders 3 are slidably connected. Each slider 3 has a mounting groove 21, in which a clamping block 22 is detachably embedded and fixed. The four clamping blocks 22 form a clamping opening 4 of variable size. Figure 8 As shown, the floating plate 2 has a rotation hole 15 with an annular step surface 16 therein. An adjusting bolt 23 passes through the rotation hole 15 and is threadedly connected to one of the sliders 3. An annular plug 17 is threadedly connected to the rotation hole 15, with the head of the adjusting bolt located between the step surface and the plug. In this embodiment, the axial length of the adjusting bolt head is less than the distance between the step surface and the plug. An adjusting spring 18 is mounted on the outer sleeve of the adjusting bolt 23. The adjusting spring 18 is located in the mounting opening 1. One end of the adjusting spring 18 acts on the floating plate 2, and the other end acts on the slider 3 connected to the adjusting bolt 23. In actual production, the plug 17 causes the head of the adjusting bolt 23 to abut against the step surface 16, positioning the adjusting bolt 23 axially. The adjusting bolt 23 is rotatably inserted into the rotation hole 15. Rotating the adjusting bolt 23 can move all the sliders 3 along the inner wall of the mounting opening 1 to change the size of the clamping opening 4. The floating plate 2 has four guide grooves 19 , each of which is penetrated by a guide bolt 20 , which is fixedly connected to the corresponding slider 3 .

[0034] During use, the tap is clamped and secured by rotating the adjusting bolt 23 to adjust the size of the clamping opening 4. The tail end of the tap is inserted into the clamping opening 4, and the adjusting bolt 23 is rotated in the opposite direction. The tap is clamped and secured by the clamping block 22. The fixing bolt 6 is threadedly connected to the mounting plate 5, leaving a few to several dozen threads of axial and radial play. The elastic force of the cylindrical spring 9 eliminates this axial play, while the deformation of the adjusting cylinder 10 eliminates this radial play. This improves the positioning accuracy of the clamping opening 4, enhances the clamping precision of the tap, and ultimately enhances machining quality.

[0035] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0036] Although this document frequently uses terms such as mounting opening 1, floating plate 2, slider 3, clamping opening 4, mounting plate 5, fixing bolt 6, first adjustment hole 7, second adjustment hole 8, cylindrical spring 9, adjustment cylinder 10, adjustment column 11, through hole 12, retaining edge 13, gasket 14, rotation hole 15, stepped surface 16, plug 17, adjustment spring 18, guide groove 19, guide bolt 20, mounting groove 21, clamping block 22, and adjustment bolt 23, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A tap clamping device, comprising a floating plate (2) with a square mounting opening (1) at the center, four sliders (3) slidably connected to the mounting opening (1), and a clamping opening (4) of variable size formed at the centers of the four sliders (3), characterized in that: The clamping device also includes a mounting plate (5), which is connected to the floating plate (2) and the mounting plate (5) by a fixing bolt (6) passing through the floating plate (2) and being threadedly connected in the mounting plate (5). A plurality of first adjustment holes (7) and a plurality of second adjustment holes (8) are provided at equal intervals on the circumferential edge of the inner side of the mounting plate (5). A cylindrical spring (9) is provided in the first adjustment hole (7). The two ends of the cylindrical spring (9) act on the floating plate (2) and the mounting plate (5) respectively. A gap is provided between the floating plate (2) and the mounting plate (5); a cylindrical and elastic adjusting cylinder (10) is fixedly connected in a tight fit in the second adjusting hole (8); a plurality of adjusting columns (11) are fixedly connected at equal intervals on the inner side of the floating plate (2); the adjusting columns (11) are tightly inserted into the corresponding adjusting cylinders (10); a gap is provided between the adjusting cylinder (10) and the floating plate (2); and a certain distance is provided between the adjusting columns (11) and the bottom of the second adjusting hole (8).

2. A tap clamping device according to claim 1, characterized in that: A plurality of through holes (12) are provided at equal intervals on the circumferential edge of the floating plate (2), and the inner side wall at the middle of the through hole (12) protrudes inward to form an annular retaining edge (13), and the fixing bolt (6) passes through the retaining edge (13), and the head of the fixing bolt (6) rests on the retaining edge (13) under the action of the elastic force of the cylindrical spring (9).

3. The tap clamping device according to claim 1, characterized in that: The cylindrical spring (9) and the adjusting cylinder (10) are both arranged along the axial direction of the mounting plate (5), and the adjusting column (11) is arranged along the axial direction of the floating plate (2).

4. A tap clamping device according to claim 1, 2 or 3, characterized in that: Both ends of the cylindrical spring (9) are provided with disc-shaped washers (14), one of the washers (14) abuts against the inner wall of the floating plate (2), and the other washers (14) abuts against the bottom of the first adjustment hole (7).

5. A tap clamping device according to claim 1, 2 or 3, characterized in that: The regulating cylinder (10) is made of a silicone material or a rubber material.

6. A tap clamping device according to claim 1, 2 or 3, characterized in that: The end surface of the regulating cylinder (10) is flush with the inner side wall of the mounting plate (5).

7. A tap clamping device according to claim 1, 2 or 3, characterized in that: The floating plate (2) has a rotating hole (15), and the rotating hole (15) has an annular step surface (16). An adjusting bolt (23) passes through the rotating hole (15) and is threadedly connected to one of the sliders (3). Rotating the adjusting bolt (23) can move all the sliders (3) along the inner wall of the mounting opening (1) to change the size of the clamping opening (4). An annular plug (17) is threadedly connected to the rotating hole (15), and the head of the adjusting bolt (23) is located between the step surface (16) and the plug (17).

8. The tap clamping device according to claim 7, characterized in that: The outer sleeve of the adjusting bolt (23) is provided with an adjusting spring (18), and the adjusting spring (18) is located in the mounting opening (1). One end of the adjusting spring (18) acts on the floating plate (2), and the other end acts on the slider (3) connected to the adjusting bolt (23).

9. A tap clamping device according to claim 1, 2 or 3, characterized in that: The floating plate (2) has four guide grooves (19), each of which is penetrated by a guide bolt (20), and the guide bolt (20) is fixedly connected to the corresponding slider (3).

10. A tap clamping device according to claim 1, 2 or 3, characterized in that: Each of the sliders (3) has a mounting groove (21), a clamping block (22) is detachably embedded and fixedly connected in the mounting groove (21), and four of the clamping blocks (22) surround the clamping opening (4).

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