Clamping device for machining multi-head spiral rotor

Abstract

The invention relates to a clamping device for machining a multi-head spiral rotor. The clamping device comprises a clamping jaw and a tip clamping head. A limiting block is fixedly arranged on the center clamping head, a limiting groove is formed in the limiting block, and one end of the clamping jaw is located in the limiting groove and limited in the limiting groove. The other end of the clamping jaw is nested at one end of the rotor, a first jackscrew is mounted on the clamping jaw, and the rotor is limited through the first jackscrew; one end of the tip chuck forms a 60-degree circular truncated cone surface, one end of the rotor is provided with an inner hole, and the chamfer of the inner hole is matched with the circular truncated cone surface, so that the rotor is matched with the tip of the circular truncated cone surface; screw holes are formed in the side faces of the limiting grooves, screws are inserted into the screw holes to fix the clamping jaws, and the rotor is prevented from twisting in the machining process; the device, a rotor machine tool chuck jaw and a tailstock center form a closed integrated structure, and the operation stability is higher.

Description

Technical Field

[0001] The invention belongs to the technical field of machine tool fixtures, and in particular relates to a clamping device for processing a multi-head spiral rotor. Background Art

[0002] The rotor is an important component of the screw drill. It cooperates with the stator to form the power motor of the screw drill. The screw drill uses mud and clean water as the power medium and transports it to the bottom of the hole through the center hole of the drill pipe. In essence, it is an energy conversion device that converts liquid pressure energy into mechanical energy. The linear quality of the rotor and stator determines the working performance of the screw motor. The rotor screw shape of the screw drill used in the oil drilling industry is complex, and the helix of the motor rotor is divided into single-head and multi-head. The fewer the number of rotor heads, the higher the speed and the smaller the torque; the more the number of heads, the lower the speed and the greater the torque. At present, due to the needs of drilling conditions, high-torque screw drills occupy a dominant position, with many rotor heads, large lead, and high processing difficulty.

[0003] The current machining process for rotors is to straighten the blank, then lathe the outer diameter, machine the API internal thread on one end, and machine the anti-drop thread on the other end. The next step is to use the CNC rotor milling machine to machine the multi-head spiral line, and finally polish the rotor on the machine tool for surface treatment. Among this series, the most complex and labor-intensive process is the CNC rotor milling machine; first, the API thread on one end of the rotor must be used to make a joint on this end (a large number of joints for each model is required), which is costly. When making the joint, it must be tightened, and it is generally clamped with a pipe clamp. The jointer goes up and steps on the handle of the pipe clamp to increase its tightening force (this action is very dangerous, and there have been cases where the pipe clamp handle has broken and people have fallen). Then it is hoisted onto the CNC milling machine, and the joint is clamped on the four-jaw chuck at one end (this requires manual alignment for each piece, which is labor-intensive and cumbersome, and is based on the rough reference part for alignment). The tailstock at the other end presses the anti-drop thread part of the rotor; after processing, the processed rotor is unloaded from the machine tool to the workpiece area, and then the joint is removed with a pipe clamp. Due to the large force when installing the joint, it must be heated with a gas welding fire before it can be removed (this loading and unloading method causes great damage to the API internal thread of the rotor, and the thread is easily damaged and the tooth shape is deformed. This part is annealed, the thread is worn, the connection strength is reduced, and safety and quality accidents occur). Since more than 3,000 rotors of various types are processed each year, it is urgent to change the clamping method. Summary of the invention

[0004] The present invention solves the technical problem by adopting the following technical solutions:

[0005] A clamping device for processing multi-head spiral rotors, including a clamping claw and a top clamping head;

[0006] A limit block is fixedly provided on the top chuck, and a limit groove is provided on the limit block. One end of the clamping claw is located in the limit groove and is limited in the limit groove; the other end of the clamping claw is embedded in one end of the rotor, and a first top screw is installed on the clamping claw, and the rotor is limited by the first top screw;

[0007] One end of the top chuck forms a 60° frustum, one end of the rotor is provided with an inner hole, and the chamfer of the inner hole matches the frustum, so that the rotor matches the top of the frustum;

[0008] The side of the limiting groove is provided with a screw hole, and the clamping claw is fixed by inserting a screw into the screw hole to prevent the rotor from twisting during processing.

[0009] Furthermore, the top chuck is a cylindrical structure, and one end is a step structure with a smaller outer diameter. The top chuck is clamped on the four-jaw chuck of the machine tool itself through the step structure.

[0010] Furthermore, a through-hole for weight reduction is provided in the axial direction inside the top chuck.

[0011] Furthermore, the top screw limits the position of the clamping claw.

[0012] Furthermore, the inner hole at the other end of the rotor is installed in cooperation with the tailstock of the machine tool to form a double-center clamping method.

[0013] Furthermore, the frustum is surface treated to increase its strength.

[0014] Furthermore, the number of the first top wires is at least two and they are symmetrically distributed in the circumferential direction of the patent.

[0015] The advantages and positive effects of the present invention are:

[0016] The present invention makes full use of the resources of the rotor itself and carries out innovative design of the inner hole and the flattening; the clamping jaw is designed as a U-shaped structure, and an adjustable top screw is added at one end to eliminate the gap; the four-jaw chuck clamps the fixture, and the tooling fixture is clamped and aligned once, and no subsequent alignment is required, which reduces the labor intensity. A group of top screws are arranged on the side of the U-shaped clamping jaw to enhance the fastening effect. This structure can be precisely adjusted according to the matching gap between the rotor and the clamping jaw during installation; the center clamp head and the U-shaped clamping jaw are provided with double top screws, which are convenient for installation and play a fastening role; the present invention and the rotor machine tool chuck jaws and the tailstock center constitute a closed integrated structure with stronger operating stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0018] Figure 1 A schematic structural diagram of a clamping device for machining a multi-head spiral rotor provided in an embodiment of the present invention;

[0019] Figure 2 A schematic structural diagram of a top chuck of a clamping device for machining a multi-head spiral rotor provided by an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the structure of the clamping jaws of a clamping device for processing a multi-head spiral rotor provided by an embodiment of the present invention;

[0021] Figure 4 A top view of a pressing plate of a clamping device for machining a multi-start spiral rotor provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] First of all, it should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature displayed or implied in the drawings, can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned in this document. In addition, in order to simplify the drawings, the same or similar technical features may be marked only in one place in the same drawing.

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0024] like Figures 1 to 4 The clamping device for processing a multi-head spiral rotor provided in this embodiment includes a clamping claw 1 and a top clamping head 9;

[0025] A limit block 3 is fixedly provided on the top chuck 9, and a limit groove 10 is provided on the limit block. One end of the clamping claw is located in the limit groove and is limited in the limit groove; the other end of the clamping claw is embedded in one end of the rotor, and a first top screw 7 is installed on the clamping claw, and the rotor is limited by the first top screw; specifically, during processing, one end of the clamping claw 1 is processed into an opposite side consistent with the flattening size of the rotor itself, and the other end is processed into a structure consistent with the size of the limit groove. These two sizes are installed in a one-to-one correspondence, and mainly play the functions of connecting and preventing rotation, and then the first top screw 7 is used to tighten, which plays a double protection role to prevent the rotor from rotating under the action of cutting force when processing the rotor spiral.

[0026] One end of the top chuck 9 forms a 60° frustum A, one end of the rotor is provided with an inner hole, and the chamfer of the inner hole matches the frustum, so that the rotor matches the top of the frustum;

[0027] An M12 baffle screw hole is provided on the side of the limiting groove, and the third top screw 8 is inserted into the screw hole to fix the claw to prevent the rotor from twisting during processing.

[0028] Specifically, in this embodiment, the top chuck 9 is a cylindrical structure, and one end is a step structure B with a smaller outer diameter. The top chuck is clamped on the four-jaw chuck of the machine tool itself through the step structure; in addition, in order to reduce the weight of the top chuck, it can be considered to open a through weight-reducing hole C in the axial direction inside the top chuck.

[0029] In order to achieve the limitation of the claw, it can be considered: also including a pressure plate 4, the pressure plate is installed on the surface of the limiting groove by bolts 5, and the limitation of the claw is achieved by a second top screw; and the first top screws are at least two, symmetrically distributed in the circumferential direction of the patent.

[0030] The inner hole at the other end of the patent is installed in cooperation with the tailstock of the machine tool to form a double-center clamping method.

[0031] The frustum is surface treated to increase its strength.

[0032] One end of the center chuck 9 in the clamping device is clamped on the four-jaw chuck of the machine tool itself, and the 60° center surface of the other end is used as a reference. The center chuck is aligned to 0.01mm through the four jaws, and the inner hole of one end of the processed rotor is installed in cooperation with the 60° center surface of the center chuck, and the inner hole of the other end is installed in cooperation with the tailstock of the machine tool to form a double-center clamping method; one end of the claw is installed on the opposite side of the rotor itself, and the other end is installed on the limit groove. The pressure plate 4 presses the installation part of the claw and the limit groove, and is tightened with the external hexagonal screw 5, and then the M12 top screw on the opposite side of the claw and the rotor is used to tighten; the rotor itself is installed through the claw to form a two-stage anti-rotation structure.

[0033] The limit groove, rotor, claws, four-claw chuck and machine tool tailstock form an anti-rotation structure; the chuck is driven by the rotation of the machine tool itself, the top chuck drives the claws to rotate, the claws drive the rotor to rotate, the tail of the rotor is tightened against the machine tool tailstock, and the top of the rotor and the rotor rotate.

[0034] The limit block is integrated with the top chuck, one end is convenient for four-jaw clamping, the top part is a 60° cone surface, and the cone surface is surface treated to increase strength; combined with the tailstock, it can effectively fix the chuck, the top chuck and the rotor, and can also provide a high-hardness and wear-resistant contact surface.

[0035] It should be noted that under the action of cutting force, the rotor is prone to gaps. Use M12 screws to flatten two screw holes in the claws to fix the rotor to prevent gaps during processing.

[0036] In this embodiment, the limit groove is a square structure, and one end of the claw is provided with an anti-rotation square arc rod that cooperates with the limit groove; of course, in order to make the limiting effect of the claw better, limit grooves and claw structures of other shapes can be used, and there is no restriction here; accordingly, the pressure plate 4 is rectangular, with two Φ13×6 countersunk holes, which cooperate with the top of the limit groove through M12 bolts, one of which is a slotted structure, in order to make it easier to disassemble the pressure plate.

[0037] The above embodiments describe the present invention in detail, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A clamping device for processing multi-head spiral rotors, characterized in that: Including claws and top chuck; A limit block is fixedly provided on the top chuck, and a limit groove is provided on the limit block. One end of the clamping claw is located in the limit groove and is limited in the limit groove; the other end of the clamping claw is embedded in one end of the rotor, and a first top screw is installed on the clamping claw, and the rotor is limited by the first top screw; One end of the top chuck forms a 60° frustum, one end of the rotor is provided with an inner hole, and the chamfer of the inner hole matches the frustum, so that the rotor matches the top of the frustum; The side of the limiting groove is provided with a screw hole, and the clamping claw is fixed by inserting a screw into the screw hole to prevent the rotor from twisting during processing.

2. The clamping device for processing a multi-head spiral rotor according to claim 1, characterized in that: The top chuck is a cylindrical structure, and one end is a step structure with a smaller outer diameter. The top chuck is clamped on the four-jaw chuck of the machine tool itself through the step structure.

3. The clamping device for processing a multi-head spiral rotor according to claim 1, characterized in that: A through-going weight-reducing hole is axially arranged inside the top chuck.

4. The clamping device for processing a multi-head spiral rotor according to claim 1, characterized in that: It also includes a pressing plate, which is installed on the surface of the limiting groove through bolts, and limits the clamping claw through a second top screw.

5. The clamping device for processing a multi-head spiral rotor according to claim 1, characterized in that: The inner hole at the other end of the rotor is installed in cooperation with the tailstock of the machine tool to form a double-center clamping method.

6. The clamping device for processing a multi-head spiral rotor according to claim 1, characterized in that: The frustum is surface treated to increase its strength.

7. The clamping device for processing a multi-head spiral rotor according to claim 1, characterized in that: There are at least two first top wires, which are symmetrically distributed in the circumferential direction of the patent.

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