Positioning and tensioning device for accessory milling head

Abstract

The utility model discloses an accessory milling head positioning and tensioning device which comprises a blind rivet, a pull claw rod and a pull claw matched with the blind rivet to loosen or tension the blind rivet, the blind rivet is installed on a milling head body, and the pull claw and the pull claw rod are installed in a rotating body on a ram. When the pull claw rod slides upwards, the pull claw rod pushes the pull claw, and the bottom of the pull claw rotates outwards and loosens the blind rivet. When the pull claw rod slides downwards, the pull claw rod pushes the pull claw, and the bottom of the pull claw rotates inwards and tensions the blind rivet. In the process of tensioning the milling head, a structural form of combining the reset spring and hydraulic tensioning is adopted, and the reinforcement piston is arranged at the upper end of the reset spring, so that the tensioning force of the milling head is increased, powerful automatic tensioning of the accessory milling head in a narrow space is realized, and the problem of slow tensioning caused by loosening of back pressure in an oil cavity is solved; the rigidity of the milling head ram joint face is improved, and the machining precision of the milling head is improved.

Description

Technical Field

[0001] This utility model relates to the field of machine tool technology, and in particular to an accessory milling head positioning and tensioning device. Background Technology

[0002] For heavy-duty machine tools, due to the different machining positions of parts, it is necessary to change attachment milling heads with different structural forms during the machining process to complete the machining of specific positions of the parts. At present, with the continuous improvement of part machining efficiency and machining accuracy, there is a need to achieve strong tensioning and automatic replacement of attachment milling heads, so as to improve the rigidity of the attachment milling head mating surface and reduce the time spent manually loading and unloading the attachment milling heads. At the same time, it is necessary to further improve the accuracy and repeatability of attachment milling head positioning, fundamentally reduce the time spent manually adjusting the accuracy of attachment milling heads and eliminate the accuracy errors caused by human factors.

[0003] With the continuous improvement of CNC system technology, the coordinate transformation function of attachment milling heads is increasingly widely used in machining. Improving the accuracy and repeatability of attachment milling head positioning has a significant impact on improving the machining quality of parts. At the same time, increasing the tension force of the attachment milling head, especially for large offset attachment milling heads, and enhancing its machining rigidity to avoid part accuracy deviations caused by loosening of the mating surfaces during machining is a necessary means to improve part machining quality. Utility Model Content

[0004] To address the problem of insufficient tension of the milling head in narrow spaces, an accessory milling head positioning and tensioning device is provided. It has a reasonable design and simple structure, which can effectively ensure the tensioning rigidity of the milling head mating surface in narrow spaces, thereby improving the machining accuracy and quality of parts.

[0005] The specific technical solution is as follows:

[0006] A milling head positioning and tightening device includes: a pull stud, a pull claw rod, and a pull claw that cooperates with the pull stud to loosen or tighten the pull stud. The pull stud is installed on the milling head body, and the pull claw and pull claw rod are installed in a rotating body on the ram.

[0007] Specifically, when the pull claw lever slides upward, it pushes the pull claw, causing the bottom of the pull claw to rotate outward and loosen the pull pin; when the pull claw lever slides downward, it pushes the pull claw, causing the bottom of the pull claw to rotate inward and tighten the pull pin.

[0008] Furthermore, the tensioning device also includes a pull rod and a return spring. The bottom of the pull rod is mounted on the pull claw rod, the return spring passes through the pull rod, and the upper part of the return spring is mounted on the pull rod.

[0009] Furthermore, the bottom of the cutter bar is mounted on the cutter claw bar via an adjusting pad.

[0010] Furthermore, a splitting pad is installed on the upper part of the pull rod, and the upper part of the return spring is installed on the splitting pad through an adjusting sleeve.

[0011] Furthermore, a threaded sleeve is screwed onto the rotating body, and the bottom of the return spring abuts against the threaded sleeve.

[0012] Furthermore, a first oil cavity is formed between the top of the cutter bar and the rotating body, and a first oil hole is provided on the rotating body, which is connected to the first oil cavity.

[0013] Furthermore, a booster piston is installed on the rotating body, and the upper part of the drawbar passes upward through the booster piston. A second oil chamber is formed between the drawbar, the booster piston, and the rotating body. A second oil hole is opened on the rotating body, and the second oil hole communicates with the second oil chamber.

[0014] Furthermore, a first oil seal ring is installed on the upper cylindrical surface of the cutter bar.

[0015] Furthermore, a fixing nut is installed on the rotating body, and the fixing nut is installed on the rotating body by a set screw. The bottom of the force-increasing piston is installed on the fixing nut.

[0016] Furthermore, a second sealing ring is installed on both the inner and outer circumferences of the booster piston.

[0017] The beneficial effects of the above scheme are:

[0018] In this invention, a combination of a return spring and hydraulic tensioning is used in the milling head tensioning process. A force-enhancing piston is arranged at the upper end of the return spring to increase the tensioning force of the milling head, thereby achieving strong automatic tensioning of the accessory milling head in a narrow space. This overcomes the problem of slow tensioning caused by the back pressure in the relaxation oil chamber, improves the rigidity of the milling head slide joint surface, and enhances the machining accuracy of the milling head. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the tensioning state of the tensioning device provided in the embodiments of this utility model;

[0020] Figure 2 This is a schematic diagram of the relaxed state of the tensioning device provided in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the relaxed state of the positioning device provided in an embodiment of this utility model.

[0022] In the attached diagram: 100, milling head body; 200, tensioning device; 201, pull stud; 202, pull claw rod; 203, pull claw; 204, pull cutter rod; 205, return spring; 206, adjusting shim; 207, splitting shim; 208, adjusting sleeve; 209, threaded sleeve; 210, first oil chamber; 211, first oil hole; 212, force-boosting piston; 213, second oil chamber; 214, second oil hole; 300, slide block; 400, rotating body; 500, positioning device; 501, positioning ring; 502, positioning sleeve; 503, positioning shaft; 504, positioning pin; 505, positioning concave key; 506, positioning convex key. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0025] The present invention will be further described below with reference to specific embodiments, but this is not intended to limit the present invention.

[0026] like Figure 1 , Figure 2 As shown, the tensioning device provided in the embodiment of this utility model includes a pull stud 201, a pull claw rod 202, and a pull claw 203 that cooperates with the pull stud 201 to loosen or tighten the pull stud 201. The pull stud 201 is installed on the milling head body 100, and the pull claw 203 and the pull claw rod 202 are installed in the rotating body 400 on the slide block.

[0027] like Figure 1 , Figure 2 As shown, the pull claw rod 202 of this utility model has a stepped structure, and the upper part of the pull claw 203 is limited by the stepped structure (it is easy to understand that in this utility model, the pull claw 203 can also be hinged to the pull claw rod 202). In use, when the pull claw rod 202 slides upward under the drive of the matching components and pushes the pull claw 203, the bottom of the pull claw 203 rotates outward and releases the pull pin 201 (as shown). Figure 2 (As shown); when the slide block 300 drives the rotating body 400 to move downwards, causing the pull claw 203 to be located outside the pull stud 201, and then the pull claw 203 is pushed under the drive of the matching components, the bottom of the pull claw 203 rotates inwards and tightens the pull stud 201 (as shown); Figure 1 (As shown).

[0028] As a specific example, such as Figure 1 , Figure 2 As shown, the above-mentioned tensioning device may further include a pull bar 204 and a return spring 205 (preferably a return disc spring). The bottom of the pull bar 204 is mounted on the claw bar 202, the return spring 205 passes through the pull bar 204, and the upper part of the return spring 205 is mounted on the pull bar 204. Under the above structure, the pull bar 204 can move down or up under the action of hydraulic oil, thereby pushing the claw 203 with the help of the claw bar 202.

[0029] It should be noted that, to facilitate the adjustment of the pull claw 203, the bottom of the pull bar 204 can be further mounted on the pull claw rod 202 via an adjusting shim 206, so that the pull claw 203 can be adjusted to a suitable position by replacing the adjusting shims 206 with different thicknesses. Simultaneously, to facilitate the adjustment of the tension of the return spring 205, a splitting shim 207 can be mounted on the upper part of the pull bar 204. The upper part of the return spring 205 is mounted on the splitting shim 207 via an adjusting sleeve 208, and a threaded sleeve 209 is screwed onto the rotating body 400 accordingly. The bottom of the return spring 205 abuts against the threaded sleeve 209, so that the tension of the disc spring 224 can be changed by altering the thickness of the adjusting sleeve 208 and / or by screwing the threaded sleeve 209.

[0030] As a specific example, such as Figure 1 , Figure 2As shown, in the above-mentioned tensioning device, a first oil cavity 210 is formed between the top of the pull rod 204 and the rotating body 400. A first oil hole 211 is provided on the rotating body 400, and the first oil hole 211 communicates with the first oil cavity 210. In the above structure, when hydraulic oil is injected into the first oil cavity 210 through the first oil hole 211, the pull rod 204 moves down under the action of hydraulic oil and pushes the pull claw 203. When oil returns from the first oil cavity 210 through the first oil hole 211, the pull rod 204 moves up under the action of hydraulic oil and pushes the pull claw 203. Based on this technical solution, to increase the tensioning force of the milling head and overcome the problem of slow tensioning caused by the back pressure in the oil chamber, a force-boosting piston 212 can be further installed on the rotating body 400 (a fixing nut 215 is installed on the rotating body 400, the fixing nut 215 is installed on the rotating body 400 by a set screw 216, and the bottom of the force-boosting piston 212 is installed on the fixing nut 215). The upper part of the drawbar 204 passes upward through the force-boosting piston 212, and a second oil chamber 213 is formed between the drawbar 204, the force-boosting piston 212 and the rotating body 400. A second oil hole 214 is provided, which is connected to the second oil cavity 213. Under the above structure, it can cooperate with the first oil cavity 210 to release or return oil. Specifically, when hydraulic oil is injected into the first oil cavity 210 through the first oil hole 211, oil can be returned from the second oil cavity 213 through the second oil hole 214 at the same time. When oil is returned from the first oil cavity 210 through the first oil hole 211, hydraulic oil can be injected into the second oil cavity 213 through the second oil hole 214 at the same time. Under the above structure, the end face of the accessory milling head and the end face of the slide can be tightly fitted, and the accessory milling head can be strongly tightened.

[0031] To achieve oil sealing, a first oil seal ring is installed on the upper cylindrical surface of the cutter bar 204, and a second seal ring is installed on both the inner and outer circles of the booster piston 212.

[0032] This embodiment also provides a positioning device 500 to position the milling head body 100 and the rotating body 400. Specifically, the positioning device 500 includes a positioning ring 501, a positioning sleeve 502 that cooperates with the positioning ring 501, a positioning shaft 503, a positioning pin 504 that cooperates with the positioning shaft 503, a positioning concave key 505, and a positioning convex key 506 that cooperates with the positioning concave key 505. During the milling head replacement process, as the slide ram 300 moves downward, the positioning sleeve 502 on the milling head body 100 first contacts the positioning ring 501 on the rotating body 400, thereby positioning the milling head. Coarse positioning in the X / Y direction; as the slide 300 continues to move downward, the positioning pin 504 enters the positioning shaft 503, and the positioning concave key 505 engages with the positioning convex key 506, completing the accurate positioning of the attachment milling head in the X / Y direction, while restricting the rotation of the milling head body around the Z axis; finally, the milling head is tightened by the tensioning device 200, so that the end face of the milling head is in contact with the end face of the slide ram, restricting the rotation of the milling head body around the X / Y direction and the movement in the Z direction, and finally achieving accurate positioning of the milling head.

[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the content of the present utility model specification should be included within the protection scope of the present utility model.

Claims

1. A positioning and tightening device for an accessory milling head, characterized in that, include: A pull stud, a pull claw rod, and a pull claw that cooperates with the pull stud to loosen or tighten the pull stud, the pull stud being mounted on the milling head body, and the pull claw and pull claw rod being mounted in a rotating body on the ram; When the pull claw rod slides downward, the pull claw rod pushes the pull claw, and the bottom of the pull claw rotates outward and releases the pull pin; When the pull claw rod slides upward, it pushes the pull claw, and the bottom of the pull claw rotates inward and tightens the pull pin.

2. The accessory milling head positioning and tensioning device according to claim 1, characterized in that, The tensioning device also includes a pull bar and a return spring. The bottom of the pull bar is mounted on the pull claw bar, the return spring passes through the pull bar, and the upper part of the return spring is mounted on the pull bar.

3. The accessory milling head positioning and tensioning device according to claim 2, characterized in that, The bottom of the pull bar is mounted on the pull claw bar via an adjusting pad.

4. The accessory milling head positioning and tensioning device according to claim 2, characterized in that, A splitting pad is installed on the upper part of the pull rod, and the upper part of the return spring is installed on the splitting pad through an adjusting sleeve.

5. The accessory milling head positioning and tensioning device according to claim 2, characterized in that, A threaded sleeve is helically mounted on the rotating body, and the bottom of the return spring abuts against the threaded sleeve.

6. The accessory milling head positioning and tensioning device according to any one of claims 2-5, characterized in that, A first oil cavity is formed between the top of the drawbar and the rotating body, and a first oil hole is provided on the rotating body, the first oil hole communicating with the first oil cavity.

7. The accessory milling head positioning and tensioning device according to any one of claims 2-5, characterized in that, A force-boosting piston is installed on the rotating body, and the upper part of the drawbar passes upward through the force-boosting piston. A second oil chamber is formed between the drawbar, the force-boosting piston, and the rotating body. A second oil hole is opened on the rotating body, and the second oil hole communicates with the second oil chamber.

8. The accessory milling head positioning and tensioning device according to claim 6, characterized in that, A first oil seal ring is installed on the upper cylindrical surface of the drawbar.

9. The accessory milling head positioning and tensioning device according to claim 7, characterized in that, A fixing nut is installed on the rotating body, and the fixing nut is installed on the rotating body by a set screw. The bottom of the force-increasing piston is installed on the fixing nut.

10. The accessory milling head positioning and tensioning device according to claim 7, characterized in that, The booster piston has a second sealing ring installed on both its inner and outer circumferences.

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