Machine tool chuck structure special for filter cover plate

Abstract

The utility model relates to a machine tool chuck structure special for a filter cover plate, and belongs to the technical field of tools. The device comprises a machine tool hollow spindle, the front end of an inner hole of the machine tool hollow spindle is a conical hole, and the large end of the conical hole is located on the end face of the machine tool hollow spindle; a clamping jaw pull rod capable of moving in the axial direction is arranged in an inner hole of the machine tool hollow spindle and comprises a clamping jaw part and a pull rod part connected with the clamping jaw part, the clamping jaw part comprises a conical face matched with the taper of the conical hole and a clamping opening used for clamping the filter cover plate, and a set of releasing grooves communicated with the clamping opening are formed in the clamping jaw part. The tail end of the pull rod part extends out of the hollow main shaft of the machine tool and is connected with a traction device; when a traction device acts on the pull rod part to move backwards, the clamping jaw part and the conical hole extrude to enable the clamping jaw to elastically deform towards the inner side so as to reduce the size of the clamping opening and clamp the filter cover plate. According to the utility model, the cover plate of the filter can be assembled and disassembled by less manual operation, and meanwhile, the assembling and disassembling speed and the thread machining efficiency are also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tooling, in particular to a special machine tool chuck structure for a filter cover plate. Background Art

[0002] As the main component of the filter, the filter cover is often provided with a threaded through hole at its center. For small-sized filter covers, the threaded through hole can generally be tapped by a tapping machine. For example, a semi-automatic filter sealing plate tapping device with publication number CN110052669A and a filter thread cover multi-station tapping machine with publication number CN104439558A both use taps for thread processing. For larger filter covers, the threaded through hole is also larger in size, and a general tapping machine cannot use taps for processing. Usually, a lathe turning process is used to process large-diameter threaded holes. During the lathe processing, the conventional chuck structure will affect the clamping efficiency.

[0003] In the prior art, for example, there is a machine tool chuck with a publication number of CN205270910U, which includes a chuck, a clamping claw, an external groove, a rubber clamping block, a rubber block, a joint and a blocking block. The chuck is provided with three clamping claws, an external groove is provided at one end of the clamping claw, and a rubber clamping block is provided on the external groove. The rubber clamping block includes a rubber block and a joint, and the joint is provided below the rubber block, and the joint is matched and connected with the external groove. Although this structure can firmly clamp the filter cover plate for its threaded hole processing, when using it, it is necessary to manually loosen or tighten the clamping claw with a wrench, and the overall operation is relatively cumbersome. At the same time, manual loading and unloading of the filter cover plate is time-consuming and labor-intensive, and the processing efficiency is low. It is particularly not conducive to batch processing. Utility Model Content

[0004] Aiming at the problem of low efficiency in machining large-diameter threaded holes of large quantities of filter covers, the utility model provides a special machine tool chuck structure for filter covers, which adopts the following technical solutions:

[0005] A filter cover plate special machine tool chuck structure, comprising a machine tool hollow spindle, wherein the front end of the inner hole of the machine tool hollow spindle is a tapered hole, and the large end of the tapered hole is located on the end face of the machine tool hollow spindle;

[0006] A claw pull rod that can move axially is provided in the inner hole of the hollow main shaft of the machine tool, and the claw pull rod includes a claw part and a connected pull rod part. The claw part includes a conical surface adapted to the taper of the tapered hole and a bayonet for clamping the filter cover. A group of release grooves connected with the bayonet are provided on the claw part, so that a plurality of claws are formed on the claw part, and the rear end of the pull rod part extends out of the hollow main shaft of the machine tool and is connected with a pulling device; when the pulling device acts on the pull rod part to move backward, the claw part and the tapered hole are squeezed to cause the claw to elastically deform inward to reduce the size of the bayonet and clamp the filter cover.

[0007] Furthermore, the pulling device includes a fixed baffle connected to the tail end of the hollow spindle of the machine tool and a movable baffle connected to the pull rod part, a group of pusher claws are hinged on the movable baffle, the front end of the pusher claws is located on one side of the outer peripheral surface of the hollow spindle of the machine tool, and the rear end is located between the fixed baffle and the movable baffle;

[0008] An annular projection is sleeved on the circumferential surface of the hollow main shaft of the machine tool, and the annular projection can be moved axially along the hollow main shaft of the machine tool under the action of a driving device; wherein the surface profile of the annular projection has a path along which the distance from the axis gradually increases when moving toward the front end of the hollow main shaft of the machine tool;

[0009] When the annular protrusion moves, the surface contour fits the front end of the claw and pushes the claw to swing, so that the rear end of the claw swings and presses against the fixed baffle to change the distance between the fixed baffle and the movable baffle, causing the claw pull rod to move axially.

[0010] Furthermore, the force arm from the front end of the pusher claw to the hinge point is greater than the force arm from the rear end of the pusher claw to the hinge point.

[0011] Furthermore, the driving device includes a cylinder, a swing arm is connected to the telescopic end of the cylinder, the other end of the swing arm is hinged to the fixed seat, a joint bearing is provided in the middle of the swing arm, the joint bearing is sleeved on the hollow main shaft of the machine tool and fixedly connected to the annular protrusion.

[0012] Furthermore, the pull rod portion is provided with an external thread; the movable baffle is threadedly connected to the pull rod portion, and a locking nut is also threadedly connected to the pull rod portion, and the locking nut is in pressure contact with the outer end surface of the movable baffle.

[0013] Furthermore, the bayonet is a circular positioning groove, and the bottom of the circular positioning groove can be in positioning contact with the inner end surface of the filter cover.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model is provided with matching tapered holes, tapered surfaces and pulling devices to realize relative displacement of the tapered holes and tapered surfaces and form an extrusion effect. The extrusion effect of the two is utilized to enable the clamping claws to undergo a certain elastic displacement inwards, thereby realizing the clamping of the filter cover. Generally speaking, the device does not require much manpower operation to realize the loading and unloading of the filter cover, and at the same time, improves the loading and unloading rate and the thread processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a special machine tool chuck structure for a filter cover plate according to an embodiment of the utility model;

[0017] Figure 2 yes Figure 1 A schematic diagram of the local structure of the A direction;

[0018] Figure 3 yes Figure 1 Schematic diagram of the local structure in the B direction.

[0019] Explanation of the reference numerals in the accompanying drawings: 1. Hollow spindle of machine tool; 11. Tapered hole; 2. Claw pull rod; 21. Claw portion; 211. Conical surface; 212. Bayonet; 213. Release groove; 214. Claw; 22. Pull rod portion; 221. External thread; 3. Pulling device; 31. Fixed baffle; 32. Movable baffle; 321. Notch; 322. Articulated hole; 323. Articulated shaft; 33. Pusher claw; 34. Annular protrusion; 341. Surface profile; 35. Locking nut; 4. Driving device; 41. Cylinder; 42. Swing arm; 43. Fixed seat; 44. Spherical bearing; 100. Filter cover. DETAILED DESCRIPTION

[0020] In order to make the present invention more clear, a filter cover plate special machine tool chuck structure of the present invention is further described below in conjunction with the accompanying drawings. The specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0021] like Figures 1 to 3As shown, a machine tool chuck structure for filter cover plate includes a machine tool hollow spindle 1 for rotating motion. The machine tool hollow spindle 1 is in a stepped cylindrical shape as a whole, and a through inner hole is provided at the center thereof. The front end of the inner hole is a tapered hole 11. The large end of the tapered hole 11 is located at the front end surface of the machine tool hollow spindle 1, and the small end of the tapered hole 11 faces the rear end of the machine tool hollow spindle 1. A claw pull rod 2 that can move in the axial direction is provided in the inner hole of the machine tool hollow spindle 1. The claw pull rod 2 is an integrated assembly, which includes a front end claw portion 21 and a coaxially connected pull rod portion 22. The claw portion 21 is in a frustum shape as a whole, and its outer peripheral surface is a tapered surface 211 that matches the taper of the tapered hole 11. The tapered surface 211 contacts the inner wall of the tapered hole 11, and the tapered surface 211 extends out of the tapered hole 11 for a distance. A bayonet 212 for clamping the filter cover 100 is provided at the center of the claw portion 21. Here, the bayonet 212 is a notch of a circular positioning groove. The bottom of the circular positioning groove can be in positioning contact with the inner end face of the filter cover 100, and the side wall of the circular positioning groove is used to contact and elastically clamp the peripheral side of the filter cover 100. In addition, a group of release grooves 213 connected to the inner side of the bayonet 212 are provided on the claw portion 21, that is, the release grooves 213 extend from the outer end face of the claw portion 21 inwardly in the axial direction, dividing the claw portion 21 into a plurality of claws 214. In this embodiment, there are eight release grooves 213, which are evenly distributed along the central circumference of the claw portion 21 to form seven claws 214. Each claw 214 is a cantilever structure and can be elastically deformed inward to achieve elastic clamping of the filter cover 100. The pull rod portion 22 is coaxially arranged with the inner hole of the hollow main shaft 1 of the machine tool, and the two are clearance-matched, and the rear end thereof extends out of the hollow main shaft 1 of the machine tool and is connected with the pulling device 3; when the pulling device 3 acts on the pull rod portion 22 to move backward, the claw portion 21 is driven to move backward, and the conical surface 211 of the claw portion 21 is squeezed with the conical hole 11 to make the claw 214 elastically deform inward, so as to reduce the size of the bayonet 212 and thereby clamp the filter cover 100.

[0022] The pulling device 3 has the function of axially pulling the rod portion 22. Considering that the force applied by the pulling device 3 to the rod portion 22 is large and the stroke of the action on the rod portion 22 is small, the following structure is preferred: the pulling device 3 includes a fixed baffle 31 connected to the tail end of the hollow spindle 1 of the machine tool. The fixed baffle 31 is in the shape of a disc and can be fixed to the tail end of the hollow spindle 1 of the machine tool by welding or fastener connection. The outer end face of the fixed baffle 31 is flush with the end face of the tail end of the hollow spindle 1 of the machine tool. A section of external thread 221 is provided on the protruding part of the rod portion 22. A movable baffle 32 is threadedly connected to the section of external thread 221. The movable baffle 32 is also in the shape of a disc, and its inner end face is parallel to the outer end face of the fixed baffle 31. The relative position of the movable baffle 32 can be changed by threaded connection, which is convenient for subsequent assembly and adjustment. A group of notches 321 are evenly distributed on the movable baffle 32, and coaxial and interpenetrating hinge holes 322 are provided on the two side walls of each notch 321. A hinge shaft 323 inserted from the side is hinged to a pusher claw 33 by means of the shaft hole matching. The front end of the pusher claw 33 crosses the fixed baffle 31 and extends to one side of the outer peripheral surface of the hollow spindle 1 of the machine tool, and the rear end is located between the fixed baffle 31 and the movable baffle 32, and the rear end of the pusher claw 33 has a pressing surface in contact with the outer end of the fixed baffle 31. Of course, the fixed baffle 31 can be provided with an avoidance groove to prevent it from interfering with the movement of the pusher claw 33, so as to simplify the volume of the pusher claw 33. Here, the hinge point of the pusher claw 33 is close to its tail end, so that the force arm from its front end to the hinge point is greater than the force arm from its rear end to the hinge point; and the rear end pressing surface of the pusher claw 33 can change the distance between the movable baffle 32 and the fixed baffle 31 when swinging. For example, the pressing surface is an inclined surface, and as the pusher claw 33 swings, the horizontal distance between the pressing point of its pressing surface and the hinge point changes.

[0023] An annular projection 34 is provided on the circumferential surface of the hollow main shaft 1 of the machine tool through a sliding sleeve. The annular projection 34 is a rotating body and can move axially along the hollow main shaft 1 of the machine tool under the action of the driving device 4 . The surface profile 341 of the annular protrusion 34 has a path in which its distance from the axis gradually increases during the movement toward the front end of the hollow spindle 1 of the machine tool. For example, in the figure, the longitudinal section profile path of the annular protrusion 34 is a gradually expanding arc curve from right to left, and of course it can also be an outward-expanding oblique line. When the annular protrusion 34 moves to the right, its surface profile 341 fits with the front end of the pusher claw 33 and pushes the pusher claw 33 to swing outward, so that the rear end of the pusher claw 33 swings and presses against the fixed baffle 31. When the swing amplitude increases, the spacing between the fixed baffle 31 and the movable baffle 32 can be increased, so that the claw pull rod 2 moves toward the tail end along its axial direction, and then acts on the claw portion 21 to squeeze the conical surface 211 and the conical hole 11, and the claw 214 elastically deforms inward to clamp the filter cover 100.

[0024] Considering that the threaded movable baffle 32 may become loose, a locking nut 35 is threadedly connected to the pull rod 22, and the locking nut 35 presses against the outer end surface of the movable baffle 32 to lock the movable baffle 32. Preferably, the external thread 221 is set as a fine pitch thread.

[0025] The drive device 4 includes a cylinder 41, which is telescopic to the right along the axial direction of the pull rod part 22, and its telescopic end is fixedly connected to one end of the swing arm 42, and the other end of the swing arm 42 is hinged to the fixed seat 43. The fixed seat 43 can be arranged on the fixed part of the machine tool, and a joint bearing 44 is arranged in the middle of the swing arm 42. The joint bearing 44 is slidably sleeved on the hollow main shaft 1 of the machine tool and is fixedly connected to the annular protrusion 34. Here, the annular protrusion 34 can be connected integrally with the joint bearing 44. When the cylinder is extended, the swing arm 42 swings at its hinge point, and at the same time drives the annular protrusion 34 to move backward. Due to the existence of the joint bearing 44, it can rotate and swing at any angle within a certain range during movement, so there will be no jamming phenomenon. Of course, the drive device 4 can also adopt other structural forms, such as a screw nut structure directly connected to the annular protrusion 34, an electric cylinder and other structures, so as to realize the linear movement of the annular protrusion 34.

[0026] The working process of the device is as follows: first, the machine tool is in the parking state, the filter cover 100 is placed in the bayonet 212, and the rear end face of the filter cover 100 is attached to the bottom of the circular positioning groove; then, the driving device works, the claw pull rod moves axially backward and clamps the filter cover 100; finally, the hollow spindle 1 of the machine tool rotates and the threading process is performed through the corresponding tool. When the threading process is completed, the hollow spindle 1 of the machine tool stops rotating, the driving device returns to its original state, the filter cover 100 is loosened from the claw part, and the threading process of the filter cover 100 is completed.

[0027] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form; any technician familiar with the field can use the above disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the utility model without departing from the scope of the technical solution of the utility model, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of protection of the technical solution of the utility model.

Claims

1. A filter cover plate special machine tool chuck structure, comprising a machine tool hollow spindle (1), characterized in that: The front end portion of the inner hole of the machine tool hollow main shaft (1) is a tapered hole (11), and the large end of the tapered hole (11) is located on the end face of the machine tool hollow main shaft (1); A claw pull rod (2) movable in the axial direction is provided in the inner hole of a hollow main shaft (1) of a machine tool. The claw pull rod (2) comprises a claw portion (21) and a connecting rod portion (22). The claw portion (21) comprises a conical surface (211) matching the taper of the conical hole (11) and a clamping opening (212) for clamping a filter cover plate (100). A set of release members connected to the clamping opening (212) are provided on the claw portion (21). The groove (213) is placed so that a plurality of claws (214) are formed on the claw portion (21), and the rear end of the pull rod portion (22) extends out of the hollow main shaft (1) of the machine tool and is connected to the pulling device (3); when the pulling device (3) acts on the pull rod portion (22) to move backward, the claw portion (21) and the tapered hole (11) are squeezed to cause the claw (214) to elastically deform inwardly to reduce the size of the clamping port (212) and clamp the filter cover (100).

2. A filter cover plate special machine tool chuck structure according to claim 1, characterized in that: The pulling device (3) comprises a fixed baffle (31) connected to the rear end of the hollow main shaft (1) of the machine tool and a movable baffle (32) connected to the pull rod portion (22); a group of pusher claws (33) are hingedly connected to the movable baffle (32); the front end of the pusher claws (33) is located on one side of the outer peripheral surface of the hollow main shaft (1) of the machine tool, and the rear end is located between the fixed baffle (31) and the movable baffle (32); An annular projection (34) is sleeved on the circumferential surface of the hollow main shaft (1) of the machine tool, and the annular projection (34) is movable along the axial direction of the hollow main shaft (1) of the machine tool under the action of a driving device (4); wherein a surface profile (341) of the annular projection (34) has a path along which a dimension of the annular projection (34) gradually increases from the axis when moving toward the front end of the hollow main shaft (1) of the machine tool; When the annular protrusion (34) moves, the surface profile (341) fits the front end of the pusher claw (33) and pushes the pusher claw (33) to swing, so that the rear end of the pusher claw (33) swings and presses against the fixed baffle (31) to change the distance between the fixed baffle (31) and the movable baffle (32), thereby causing the claw pull rod (2) to move axially.

3. A filter cover plate special machine tool chuck structure according to claim 2, characterized in that: The force arm from the front end of the pusher claw (33) to the hinge point is greater than the force arm from the rear end of the pusher claw (33) to the hinge point.

4. A filter cover plate special machine tool chuck structure according to claim 3, characterized in that: The driving device (4) comprises a cylinder (41), a swing arm (42) being connected to the telescopic end of the cylinder (41), the other end of the swing arm (42) being hinged to a fixed seat (43), a joint bearing (44) being provided in the middle of the swing arm (42), the joint bearing (44) being sleeved on the hollow main shaft (1) of the machine tool and fixedly connected to the annular protrusion (34).

5. The filter cover plate special machine tool chuck structure according to claim 4, characterized in that: The pull rod portion (22) is provided with an external thread (221); the movable baffle (32) is threadedly connected to the pull rod portion (22); a locking nut (35) is also threadedly connected to the pull rod portion (22); the locking nut (35) is in pressing contact with the outer end surface of the movable baffle (32).

6. The filter cover plate special machine tool chuck structure according to claim 1, characterized in that: The bayonet (212) is a circular positioning groove, the bottom of which can be in positioning contact with the inner end surface of the filter cover plate (100).

Images