Electric self-centering three-jaw clamping chuck

Abstract

The utility model provides an electric self-centering three-jaw material clamping chuck which comprises a machine frame, a main shaft rotatably arranged in the machine frame, a rotation driving mechanism arranged on the machine frame and used for driving the main shaft to rotate, and a chuck body arranged at the front end of the machine frame and fixedly connected with the main shaft. The circular-ring-shaped double-sided gear is rotatably arranged in the disc body, transmission teeth are arranged on the rear end face of the circular-ring-shaped double-sided gear, plane threads are arranged on the front end face of the circular-ring-shaped double-sided gear, and the bevel gear is rotatably arranged in the disc body and meshed with the transmission teeth on the rear end face of the circular-ring-shaped double-sided gear; the three clamping jaws are movably arranged on the front end face of the disc body and meshed with plane threads on the front end face of the circular-ring-shaped double-face gear, and the three clamping jaws are automatically connected with the bevel gear in an inserted mode to drive the bevel gear to rotate forwards or backwards in the using process so that the three clamping jaws can correspondingly clamp a machined workpiece or loosen the machined workpiece. And the automatic clamping driving mechanism is automatically separated from the bevel gear after the clamping or loosening action is completed. By arranging the automatic clamping driving mechanism, manpower can be saved, and the cutting machining efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipe cutting processing machinery parts technical field, concretely relates to a kind of electric self-centering three-jaw clamping chuck. BACKGROUND

[0002] On pipe or bar cutting equipment, chuck is needed to clamp pipe or bar and drive pipe or bar to rotate, to provide cutting for cutting knife to pipe or bar cutting processing. The commonly used chuck is self-centering three-jaw clamping chuck, its structure is shown as Figure 1 , (part of structure can refer to Figure 4 ), it includes rack 1, main shaft 2 rotatably arranged in rack 1, rotating drive mechanism 3 arranged on rack 1 for driving main shaft 2 to rotate, disc body 4 arranged at the front end of rack 1 and fixedly connected with main shaft 2, circular ring double-sided gear 5 rotatably arranged in disc body 4 (one week transmission tooth is arranged on rear end face, and front end face is provided with the plane thread of Archimedes spiral shape), umbrella gear 6 rotatably arranged in disc body 4 and meshed with transmission tooth on the rear end face of circular ring double-sided gear 5, three self-centering clamping claws 7 movably arranged on the front end face of disc body 4 and meshed with the plane thread on the front end face of circular ring double-sided gear 5 (rear end face of clamping claw 7 is provided with the thread matched with the plane thread on the front end face of circular ring double-sided gear 5), and clamping drive handle 8 for driving umbrella gear 6 to rotate when being used, the center of the chuck is provided with front-to-back through central hole 100 for pipe or bar passing. When the chuck is used, first, pipe or bar is inserted into central hole 100, then clamping drive handle 8 is sleeved with the upper end of umbrella gear 6, artificial drives umbrella gear 6 to rotate by using clamping drive handle 8, in turn drives circular ring double-sided gear 5 to rotate, circular ring double-sided gear 5 rotates and drives three clamping claws 7 to do centripetal clamping motion synchronously by the plane thread on its front end face, so as to clamp pipe or bar in the middle of central hole 100 of chuck (i.e. self-centering), then clamping drive handle 8 is taken away, main shaft 2 is driven to rotate by starting rotating drive mechanism 3, disc body 4 and clamped pipe or bar are driven to rotate together, and cutting is carried out by cutting knife; when cutting is completed, three clamping claws 7 are driven to do opening motion away from the center synchronously by artificial driving umbrella gear 6 to rotate reversely by using clamping drive handle 8, so as to release pipe or bar, after pipe or bar advances in central hole 100, the above-mentioned action is repeated. As can be seen from the foregoing, the existing self-centering three-jaw clamping chuck needs artificial frequent participation in clamping and releasing operation of pipe or bar, which wastes manpower and seriously affects the production efficiency of cutting processing. SUMMARY

[0003] The utility model aims at: for solving the above-mentioned technical problems existing in prior art, provide a kind of electric self-centering three-jaw clamping chuck of structural improvement.

[0004] The utility model discloses a technical scheme: the utility model discloses electric self-centering three -jaw clamp chuck, including frame, rotatably located in the main shaft of frame, be located on the frame for driving the rotation of main shaft's rotation drive mechanism, be located in the front end of frame and with the fixed connection of main shaft's disc, rotatably located in the disc and the rear end surface is equipped with transmission gear, the front end surface of circular ring double -sided gear that is equipped with plane thread, rotatably located in the disc and with the transmission gear on the rear end surface of circular ring double -sided gear meshing's umbrella -shaped gear, the front end surface of disc is movably equipped with three clamping claws and with the plane thread on the front end surface of circular ring double -sided gear meshing, its structural features are: still including automatic and umbrella -shaped gear plug -in drive umbrella -shaped gear forward rotation or reverse rotation corresponding make three clamping claws clamp the workpiece or loosen the workpiece, and after the completion of clamping or loosening action, automatic and umbrella -shaped gear disengaging's automatic clamping drive mechanism.

[0005] Further scheme is: the above-mentioned automatic clamping drive mechanism includes the support of fixedly being equipped with on the upper end surface of frame, the sliding shaft for with the upper end of umbrella -shaped gear plug -in and transmission connection, the speed reducer of fixedly being equipped with on the support and with sliding shaft transmission connection, the clamping drive motor of fixedly being equipped with on the support and with speed reducer transmission connection, through the installation frame fixedly being equipped with on the upper side of speed reducer for driving sliding shaft up and down movement's cylinder with piston rod, be located in the installation frame and with the piston rod of cylinder fixed connection and be equipped with bearing's sliding axle connector, the spring of sleeve joint on the upper part outer end of sliding axle and the upper and lower ends respectively with sliding axle connector and speed reducer elastic abutment, the inner ring of the bearing of sliding axle's upper end and sliding axle connector is fixedly connected, and the plug -in tenon of the shape of the plug -in hole of the upper end of umbrella -shaped gear is matched on the lower end of sliding axle.

[0006] Further scheme is: the rear end surface of the above-mentioned three clamping claws is equipped with the thread that is matched with the plane thread on the front end surface of circular ring double -sided gear, and the three clamping claws are engaged by the thread on the rear end surface and the plane thread on the front end surface of circular ring double -sided gear.

[0007] Further scheme is: the above-mentioned three clamping claws are evenly spaced on the front end surface of disc in the way that the included angle between adjacent two clamping claws is 120 degrees.

[0008] The utility model has the positive effect: the utility model discloses through setting up automatic clamping drive mechanism to replace the clamping drive handle in prior art, and the umbrella -shaped gear is driven to rotate reversely to realize that three clamping claws are synchronous to pipe or bar and make clamping and loosening action, need not manual operation, save manpower and improve cutting production efficiency greatly, effectively solve the technical problem that the similar chuck in prior art needs manual participation frequently to clamp and loosen pipe or bar in work and causes waste manpower and seriously influences cutting processing production efficiency. DRAWINGS

[0009] Figure 1 The structure schematic view of a manual self-centering three-jaw clamping chuck of prior art similar to the utility model, for the convenience of observing the internal structure of the chuck, a partial section view is also shown in the structure schematic view;

[0010] Figure 2 The planar structure schematic view of the utility model;

[0011] Figure 3 The left view of Figure 2 for the convenience of observing the internal structure of the chuck, a partial section view is also shown in the structure schematic view;

[0012] Figure 4 The three-dimensional structure schematic view of the utility model.

[0013] The reference signs in the above-mentioned drawings are as follows:

[0014] Frame 1; main shaft 2; rotary driving mechanism 3; disc body 4; circular ring double-sided gear 5; umbrella-shaped gear 6; clamping jaw 7; clamping driving handle 8; automatic clamping driving mechanism 9, support 91, sliding shaft 92, plug-in tenon 92-1, speed reducer 93, clamping driving motor 94, air cylinder 95, mounting rack 95-1, sliding shaft connecting piece 96, spring 97; center hole 100. DETAILED DESCRIPTION

[0015] The utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0016] (Example 1)

[0017] See Figures 2 to 4 The electric self-centering three-jaw clamping chuck of the embodiment mainly comprises a frame 1, a main shaft 2, a rotary driving mechanism 3, a disc body 4, a circular ring double-sided gear 5, an umbrella-shaped gear 6, a clamping jaw 7 and an automatic clamping driving mechanism 9.

[0018] The rack 1 is used as a mounting base, the main shaft 2 is rotatably arranged in the rack 1, the rotating driving mechanism 3 is arranged on the rack 1 and is in transmission connection with the main shaft 2 for driving the main shaft 2 to rotate, the disc body 4 is arranged at the front end of the rack 1 and is fixedly connected with the main shaft 2 and rotates with the main shaft 2, the circular ring double-sided gear 5 is rotatably arranged in the disc body 4, the rear end surface of the circular ring double-sided gear 5 is fully provided with a week transmission tooth, the front end surface is provided with a plane thread in the shape of Archimedes spiral, the umbrella-shaped gear 6 is rotatably arranged in the disc body 4 and is located above the rear side of the circular ring double-sided gear 5, the umbrella-shaped gear 6 is in meshing transmission with the transmission tooth on the rear end surface of the circular ring double-sided gear 5; the rear end surface of the clamping jaw 7 is provided with a thread matched with the plane thread on the front end surface of the circular ring double-sided gear 5, three clamping jaws 7 are uniformly and spacedly arranged on the front end surface of the disc body 4 and each clamping jaw 7 is in meshing transmission with the plane thread on the front end surface of the circular ring double-sided gear 5 through the thread on the rear end surface of the clamping jaw 7 so as to realize the synchronous driving of the three clamping jaws 7 by the circular ring double-sided gear 5. The axial center of the chuck is provided with a central hole 100 penetrating front and back for the pipe or rod to pass through. The technical features described in this section are the same as the prior art and are not described in detail. Preferably, the three clamping jaws 7 are uniformly and spacedly arranged on the front end surface of the disc body 4 with an angle of 120 degrees between adjacent two clamping jaws 7.

[0019] Unlike the prior art, the automatic clamping driving mechanism 9 is provided in the embodiment to replace the manual clamping driving handle 8 in the prior art.

[0020] The automatic clamping driving mechanism 9 is used to automatically plug and drive the umbrella-shaped gear 6 in forward or reverse rotation to correspondingly make the three clamping jaws 7 self-centering to clamp or loosen the workpiece (pipe or rod), and automatically disengage from the umbrella-shaped gear 6 after the clamping or loosening action is completed.

[0021] As a specific implementation, the automatic clamping driving mechanism 9 in the embodiment includes a bracket 91 fixedly arranged on the upper end surface of the rack 1, a sliding shaft 92 for plugging and transmission connection with the upper end of the umbrella-shaped gear 6, a speed reducer 93 fixedly arranged on the bracket 91 and in transmission connection with the sliding shaft 92, a clamping driving motor 94 fixedly arranged on the bracket 91 and in transmission connection with the speed reducer 93, a gas cylinder 95 with a piston rod fixedly arranged above the speed reducer 93 through a matched mounting bracket 95-1 for driving the sliding shaft 92 to move up and down, a sliding shaft connecting piece 96 fixedly connected with the piston rod of the gas cylinder 95 and provided with a bearing inside, a spring 97 sleeved on the upper outer end of the sliding shaft 92 and elastically abutting with the sliding shaft connecting piece 96 and the speed reducer 93 at the upper and lower ends respectively; the upper end of the sliding shaft 92 is fixedly connected with the inner ring of the bearing provided inside the sliding shaft connecting piece 96, and the lower end of the sliding shaft 92 is provided with a plugging tenon 92-1 matched with the shape of the plugging hole provided on the upper end of the umbrella-shaped gear 6.

[0022] The working principle and process of the electric self-centering three-jaw clamping chuck of the embodiment are briefly described as follows:

[0023] In the initial state, the three clamping jaws 7 are in the open state, and the sliding shaft 92 is in the disengaged state with the umbrella-shaped gear 6. The pipe or bar to be cut is inserted into the central hole 100, and the automatic clamping drive mechanism 9 is started. The piston rod of the air cylinder 95 drives the sliding shaft connecting piece 96 to overcome the elastic resistance of the spring 96 and push the sliding shaft 92 downward to make the insertion tenon 92-1 at the lower end of the sliding shaft 92 inserted into and transmissionally connected with the insertion hole at the upper end of the umbrella-shaped gear 6. The clamping drive motor 94 drives the sliding shaft 92 to rotate in the forward direction through the speed reducer 93, and the sliding shaft 92 drives the umbrella-shaped gear 6 to rotate in the forward direction. The umbrella-shaped gear 6 drives the circular ring-shaped double-sided gear 5 to rotate, and the circular ring-shaped double-sided gear 5 drives the three clamping jaws 7 to move synchronously and centripetally through the plane thread on the front end face to clamp the pipe or bar at the middle of the central hole 100 of the chuck. After the pipe or bar is clamped, the clamping drive motor 94 stops moving to make the sliding shaft 92 stop rotating. Under the joint action of the air cylinder 95 and the spring 97, the sliding shaft 92 is quickly moved upward by the sliding shaft connecting piece 96 to make the insertion tenon 92-1 quickly disengage from the insertion hole at the upper end of the umbrella-shaped gear 6. At this time, the rotating drive mechanism 3 can be started to drive the main shaft 2 to rotate, and the disc body 4 and the pipe or bar clamped by the three clamping jaws 7 rotate together to be cut by the cutting knife. After cutting is completed, the insertion tenon 92-1 of the sliding shaft 92 is inserted into the insertion hole at the upper end of the umbrella-shaped gear 6 again as described above, and the clamping drive motor 94 drives the sliding shaft 92 to rotate in the reverse direction through the speed reducer 93 to make the three clamping jaws 7 move synchronously and away from the center to release the pipe or bar. When the other accessories of the cutting machine drive the pipe or bar to advance in the central hole 100 by a certain distance, the above-mentioned operation is repeated to cut the pipe or bar by the next segment. The above-mentioned operation is repeated.

[0024] As can be seen from the foregoing, the electric self-centering three-jaw clamping chuck of the embodiment can automatically realize the clamping and releasing operation of the three clamping jaws 7 on the pipe or bar to be processed by setting the automatic clamping drive mechanism 9, and the manual frequent participation in the clamping and releasing operation of the pipe or bar to be processed is not required as in the prior art, thereby saving manpower and greatly improving the production efficiency of cutting processing.

[0025] The above embodiments are descriptions of specific embodiments of the present application, rather than limitations of the present application. Those skilled in the related technical field can make various modifications and changes without departing from the spirit and scope of the present application to obtain corresponding equivalent technical solutions, and therefore all equivalent technical solutions should be included in the patent protection scope of the present application.

Claims

1. An electric self-centering three-jaw clamping chuck, comprising a frame, a spindle rotatably arranged in the frame, a rotation driving mechanism arranged on the frame for driving the spindle to rotate, a disc body arranged at the front end of the frame and fixedly connected with the spindle, a circular ring-shaped double-sided gear rotatably arranged in the disc body and provided with transmission teeth on the rear end surface and a flat thread on the front end surface, an umbrella-shaped gear rotatably arranged in the disc body and meshing with the transmission teeth on the rear end surface of the circular ring-shaped double-sided gear, and three clamping jaws movably arranged on the front end surface of the disc body and meshing with the flat thread on the front end surface of the circular ring-shaped double-sided gear, characterized in that: the three clamping jaws are arranged in a triangular shape, and the front end surface of each clamping jaw is provided with a clamping jaw thread. The automatic clamping driving mechanism comprises a bracket fixed on the upper end surface of the frame, a sliding shaft for plugging and driving connection with the upper end of the bevel gear, a speed reducer fixed on the bracket and driving connected with the sliding shaft, a clamping driving motor fixed on the bracket and driving connected with the speed reducer, a gas cylinder with a piston rod for driving the sliding shaft to move up and down, which is fixed above the speed reducer through a mounting bracket, a sliding shaft connecting piece fixedly connected with the piston rod of the gas cylinder and provided with a bearing inside, and a spring sleeved on the outer end of the upper part of the sliding shaft and elastically abutting against the sliding shaft connecting piece and the speed reducer at the upper and lower ends, respectively.

2. The motorized self-centering three-jaw gripper chuck according to claim 1, characterized in that: The upper end of the sliding shaft is fixedly connected with the inner ring of the bearing in the sliding shaft connecting piece, and the lower end of the sliding shaft is provided with a plugging tenon matched with the shape of the plugging hole provided on the upper end of the bevel gear.

3. The motorized self-centering three-jaw gripper chuck of claim 1, wherein: The rear end surface of the three clamping claws is provided with a thread matched with the flat thread on the front end surface of the circular ring double-sided gear, and the three clamping claws are engaged by the thread on the rear end surface and the flat thread on the front end surface of the circular ring double-sided gear.

4. The motorized self-centering three-jaw gripper chuck of claim 1, wherein: The three clamping claws are uniformly spaced on the front end surface of the disc body with an angle of 120 degrees between the adjacent two clamping claws.

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