Double-claw center frame

Abstract

The utility model relates to a double-claw center frame, and belongs to the technical field of center frames. The first clamping jaw piece and the second clamping jaw piece are arranged on the center frame body, the connecting rod is connected with the first clamping jaw piece, the second clamping jaw piece and the driving assembly, and the driving assembly drives the first clamping jaw piece and the second clamping jaw piece to move synchronously through the connecting rod. The center frame has the effects of simplifying the structure of the center frame, reducing the cost and improving the synchronism.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of center frames, in particular to a double-claw center frame. BACKGROUND

[0002] The center frame of the grinding machine is mainly used for supporting and fixing workpieces and providing accurate positioning and processing platforms. It can ensure the stability and accuracy during the processing process, thereby improving the coaxiality of the processed workpieces and meeting the radial runout requirements.

[0003] The center frame of the machine tool is widely used in the machining of slender shaft parts and is an auxiliary device for supporting the rotating workpiece in the radial direction during the machining process. The existing center frame of the machine tool adopts double-claw clamping to release the stress generated during the machining of the workpiece. One claw is used for abutting against the surface of the workpiece, and the other claw is used for rotating and abutting against the surface of the workpiece. However, the existing double-claw positioning usually adopts two sets of driving members to drive the double claws, so that the overall structure of the center frame is relatively complex, and the clamping synchronization is low.

[0004] In view of the related technology in the above, it is necessary to provide a double-claw center frame with simple structure and high synchronization. CONTENT OF THE INVENTION

[0005] In order to simplify the structure of the center frame and reduce the production cost, the application provides a double-claw center frame.

[0006] The double-claw center frame provided by the application adopts the following technical scheme:

[0007] The double-claw center frame comprises a center frame body, a first clamping jaw member and a second clamping jaw member which are slidably arranged on the center frame body, and a driving assembly, further comprising a connecting rod connecting the first clamping jaw member, the second clamping jaw member and the driving assembly, and the driving assembly drives the first clamping jaw member and the second clamping jaw member to move synchronously through the connecting rod.

[0008] By adopting the above technical scheme, after the workpiece is pre-positioned on the machine tool, the driving assembly is started, and the connecting rod connects the driving assembly, the first clamping jaw member and the second clamping jaw member, so that the driving assembly can drive the first clamping jaw member and the second clamping jaw member to clamp the workpiece at the same time through the connecting rod. Through the arrangement of the connecting rod, one set of driving assemblies can be arranged on the center frame body to realize the synchronous driving of the two clamping jaws of the center frame. Compared with the two sets of driving assemblies in the prior art, the center frame of the application has the effects of simplifying the structure and reducing the cost, and the synchronization of the two clamping jaw members is improved.

[0009] Optionally, the driving assembly comprises a piston rod, a piston head arranged at one end of the piston rod, and a damper arranged at the other end of the piston rod, the center frame body has a sealing chamber for sealing sliding of the piston head, the piston rod is provided with a piston connecting hole for inserting the connecting rod, and a fixed shaft fixedly connected with the connecting rod is arranged on the inner wall of the piston connecting hole.

[0010] By adopting the above technical scheme, the structural composition of the driving assembly is disclosed, the driving assembly adopts the driving mode of the piston rod, has strong driving force, high stability and reliability, and is convenient to maintain and maintain.

[0011] Optionally, the first clamping jaw comprises a first supporting shaft slidingly arranged in the center frame body and a first supporting block arranged at the end of the first supporting shaft and used for abutting against the workpiece, and the first supporting shaft is provided with a first connecting hole for inserting the connecting shaft.

[0012] The second clamping jaw comprises a second supporting shaft slidingly arranged in the center frame body, a pushing arm arranged at the end of the second supporting shaft, a clamping arm rotationally arranged in the center frame body, and a second supporting block arranged on the clamping arm, the second supporting shaft is provided with a second connecting hole for inserting the connecting shaft, and the pushing arm slidingly drives the clamping arm to rotate.

[0013] By adopting the above technical scheme, the structural composition of the first clamping jaw and the second clamping jaw is specifically disclosed, the first supporting shaft and the second supporting shaft are both slidingly installed in the center frame body and are respectively provided with the first connecting hole and the second connecting hole for cooperating with the connecting rod, when the driving assembly drives the connecting rod to move, the first supporting block slidingly abuts against the workpiece, and the second supporting block rotationally abuts against the workpiece, thereby achieving clamping of the workpiece.

[0014] Optionally, the clamping arm is provided with a rotating end rotationally cooperating with the center frame body, the clamping arm is provided with a sliding strip-shaped hole at the side away from the rotating end, and the pushing arm has a fixed pin shaft slidingly arranged in the sliding strip-shaped hole.

[0015] By adopting the above technical scheme, one end of the clamping arm is rotationally installed in the center frame body, the end of the pushing arm and the clamping arm slidingly cooperate, so that when the second supporting rod drives the pushing arm to slide, the pushing arm can rotate around the rotating end as the axis center by cooperation of the sliding shaft and the sliding strip-shaped hole, thereby converting the horizontal force into the rotating force.

[0016] Optionally, the clamping arm is provided with a guide inclined surface for abutting against the end of the pushing arm, and the inclination direction of the guide inclined surface is parallel to the extension direction of the sliding strip-shaped hole.

[0017] By adopting the above technical solution, the contact area between the guide ramp and the push arm is increased when the push arm and the clamping arm rotate. Compared with the rotation of the push arm achieved only by the sliding shaft, the contact between the guide ramp and the push arm makes the rotation of the push arm more stable.

[0018] Optionally, the clamping arm has a conforming arc surface on the side facing away from the guide slope.

[0019] By adopting the above technical solution and the setting of conforming to the arc surface, the contact area between the second gripper and the workpiece can be increased, the clamping stability can be improved, and the stress concentration per unit area can be reduced.

[0020] Optionally, the first gripper and the second gripper are respectively disposed on both sides of the piston rod, and the rotating end and the piston rod are correspondingly disposed.

[0021] By adopting the above technical solution, the positional relationship between the two gripper components and the piston rod is disclosed. The gripper components are arranged on both sides of the piston rod. Compared with the two gripper components being arranged on one side of the piston rod, the above arrangement can balance the clamping force and improve the clamping stability.

[0022] Optionally, an adjustment assembly for fine-tuning the first and second grippers is provided on the outer side of the central frame. The adjustment assembly includes an adjustment knob connected to the first or second support shaft and a detection element for monitoring the adjustment distance.

[0023] By adopting the above technical solution, after the drive component is started and the workpiece is clamped, the operator can rotate the adjustment knob to move the first support shaft and the second support shaft back and forth, thereby achieving fine-tuning of the workpiece clamping.

[0024] Optionally, the central frame has a clearance groove for the clamping arm to be rotated.

[0025] By adopting the above technical solution, the clamping arm is rotatably positioned in the relief groove, which can protect the clamping arm.

[0026] Optionally, it also includes a support base for fixing to the machine tool, the central frame having a notch corresponding to the clearance groove, and the support base having a compensation surface corresponding to the notch.

[0027] By adopting the above technical solution, the notch on the central frame can save the overall manufacturing materials of the central frame and reduce costs. The compensation surface of the support base can improve the stability of the central frame and the support base. The support base facilitates the fixed installation of the central frame on the grinding machine.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. By setting a connecting rod, this application enables two gripper parts to be driven synchronously by a set of drive components, which simplifies the structure of the center frame, reduces costs, and improves the synchronization of the two gripper parts;

[0030] 2. This application utilizes the cooperation between the guide ramp and the push arm to make the rotation of the push arm more stable;

[0031] 3. By setting the clearance groove, this application allows the clamping arm to be arranged in the clearance groove when the center frame is not working, thus providing a protective function. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0033] Figure 2 This is a cross-sectional schematic diagram of an embodiment of this application.

[0034] Figure 3 This is a structural schematic diagram of an embodiment of this application without the central frame installed.

[0035] Figure 4 This is a schematic diagram of the structure of the adjustment component according to an embodiment of this application.

[0036] Figure 5 This is an exploded view of the central frame and support base of an embodiment of this application.

[0037] Explanation of reference numerals in the attached drawings: 1. Central frame; 11. Sealed chamber; 111. Cylinder plug; 12. Oil pipe connector; 13. Sliding chamber; 14. Sensor; 15. Clamping fixing seat; 16. Relief groove; 17. Notch; 2. First gripper; 21. First support shaft; 211. First connecting hole; 22. First support block; 3. Second gripper; 31. Second support shaft; 311. Second connecting hole; 32. Push arm; 321. Fixing pin; 322. Arc-shaped contact surface 33. Clamping arm; 331. Rotating end; 332. Sliding strip hole; 333. Mounting groove; 3331. Guide slope; 334. Fitting arc surface; 34. Second support block; 4. Drive assembly; 41. Piston rod; 411. Piston connecting hole; 412. Fixed shaft; 42. Piston head; 43. Damper; 5. Connecting rod; 51. Sensing end; 6. Adjustment assembly; 61. Adjustment knob; 62. Detection piece; 63. Transmission rod; 7. Support base; 71. Compensation surface. Detailed Implementation

[0038] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0039] This application discloses a double-claw center frame.

[0040] Reference Figure 1 A dual-jaw center frame includes a center frame body 1, a first gripper 2, a second gripper 3, a drive assembly 4, a connecting rod 5, and an adjustment assembly 6. The connecting rod 5 connects the first gripper 2, the second gripper 3, and the drive assembly 4, enabling the drive assembly 4 to simultaneously drive the first gripper 2 and the second gripper 3. The length direction of the center frame body is defined as the X-direction, the width direction as the Y-direction, and the height direction as the Z-direction.

[0041] The drive assembly 4 includes a piston rod 41 slidably mounted on a central frame 1, a piston head 42 disposed at one end of the piston rod 41, and a damper 43 disposed at the other end of the piston rod 41. The piston head 42 is located within the central frame 1, which has a sealing chamber 11 for sealing the piston head 42. A hydraulic cylinder plug 111 that seals against the piston rod 41 is installed within the sealing chamber 11. The central frame 1 has an oil port communicating with the sealing chamber 11, and an oil pipe connector 12 is disposed within the oil port for communicating with hydraulic oil. In other embodiments, the drive assembly 4 may be a manual push rod structure.

[0042] The damper 43 is partially located inside the central frame 1 and fixedly connected to the piston rod 41 by bolts, while the other part extends outside the central frame 1. By setting up the damper 43, the vibration of the piston rod 41 during sliding can be reduced, thereby improving the stability and safety of the central frame.

[0043] The piston rod 41 has a piston connection hole 411 in its middle section, which penetrates the side wall and allows the connection hole to be inserted. The width of the piston connection hole 411 in the X direction is adapted to the width of the connecting rod 5. A fixed shaft 412 is provided on the inner wall of the piston connection hole 411 to engage with the connecting rod 5, thus achieving a fixed connection between the connecting rod 5 and the piston rod 41. The central frame 1 has a sliding chamber 13 for the connecting rod 5 to slide in the X direction.

[0044] The first gripper 2 and the second gripper 3 are respectively disposed on both sides of the piston rod 41. The first gripper 2 is located on the top side of the central frame 1, and the first gripper 2 includes a first support shaft 21 slidably mounted on the central frame 1 and a first support block 22 fixedly mounted on the end of the first support shaft 21.

[0045] The first support shaft 21 is slidably installed along the X direction, with one end passing through the central frame 1 and fixed to the first support block 22 by bolts. The first support block 22 can be disassembled and replaced according to the size of the workpiece. The other end of the first support shaft 21 passes through the other side of the central frame 1, and the adjustment component 6 is located at the other end of the support shaft.

[0046] The first support shaft 21 has a first connecting hole 211 in its middle, corresponding to the piston connecting hole 411, and the first connecting hole 211 penetrates the side wall of the first support shaft 21. The end of the connecting rod 5 has a sensing end 51 extending toward the top of the central frame 1. A sensor 14 corresponding to the sensing end 51 is installed on the top of the central frame 1. The sensor 14 is used to monitor the position of the connecting rod 5 inside the central frame 1.

[0047] The second gripper 3 includes one side of the bottom of the central frame 1. The second gripper 3 includes a second support shaft 31 slidably mounted on the central frame 1, a push arm 32 fixedly mounted on the end of the second support shaft 31, a clamping arm 33 rotatably mounted on the central frame 1, and a second support block 34 mounted on the clamping arm 33 and used to abut against the workpiece.

[0048] The structure of the second support shaft 31 is the same as that of the first support shaft 21. The second support shaft 31 has a second connecting hole 311 corresponding to the piston connecting hole 411. That is, the first connecting hole 211, the piston connecting hole 411 and the second connecting hole 311 are arranged coaxially in the Z direction.

[0049] The push arm 32 is bolted to one end of the support shaft, and the cross-section of the push arm 32 is L-shaped. The clamping arm 33 is an arc-shaped block, with a rotating end 331 at one end. The central frame 1 is provided with a clamping and fixing seat 15 between the push arm 32 and the first support block 22, which rotates and engages with the rotating end 331.

[0050] The clamping arm 33 has a sliding slot 332 extending through both side walls on the side away from the rotating end 331. The axis of the sliding slot 332 intersects with the second support shaft 31. A fixing pin 321 for passing through the sliding slot 332 is inserted into the upper part of the pushing arm 32. When the second support shaft 31 drives the pushing arm 32 to move in the X direction, the fixing pin 321 abuts against the inner wall of the sliding slot 332, causing the clamping arm 33 to rotate around the clamping base 15. The distance the fixing pin 321 moves in the sliding slot 332 is the clamping range of the clamping arm 33.

[0051] The end of the push arm 32 is provided with an arc-shaped abutment surface 322, and the two side walls of the clamping arm 33 have mounting grooves 333 for arranging the push arm 32, and the side walls of the mounting grooves 333 are provided with guide slopes 3331 for the arc-shaped abutment surface 322 to abut. The inclination direction of the guide slopes 3331 is parallel to the axial direction of the sliding strip hole 332.

[0052] The second support block 34 is fixedly installed at the other end of the clamping arm 33. The clamping arm 33 has a conforming arc surface 334 on its inner side away from the guide slope 3331, which is used to increase the contact area between the gripper and the workpiece and improve the stability of clamping. The central frame 1 also has a relief groove 16 for the clamping arm 33 to rotate, so that when the central frame is not working, the entire clamping arm 33 is located in the relief groove 16, which provides protection for the clamping arm 33.

[0053] The adjustment component 6 can be installed at the end of the first support shaft 21 or the second support shaft 31. In this embodiment, it is installed on the first support shaft 21 as an example. The adjustment component 6 includes an adjustment knob 61 and a detection element 62. The adjustment knob 61 is connected to the end of the first support shaft 21 away from the first support block 22, and the detection element 62 is fixedly installed on the side wall of the central frame 1. When the adjustment knob 61 is rotated, it can drive the first support shaft 21 to slide in the X direction, and the amount of sliding displacement can be reflected in the detection element 62. The detection element 62 is a dial indicator of the prior art. A transmission rod 63 is provided between the detection element 62 and the adjustment knob 61. The adjustment knob 61 transmits the sliding amount of the first support shaft 21 to the detection element 62 through the transmission rod 63.

[0054] To reduce the size of the center frame 1 and lower manufacturing costs, the bottom of the center frame 1 has a notch 17, which is an inclined opening. A support base 7 for mounting to the grinding machine is fixedly installed at the notch 17 on the center frame 1. The support base 7 has a compensation surface 71 that mates with the notch 17, and the support base 7 and the center frame 1 combine to form a complete rectangular block. Different sizes of support bases 7 can be used depending on the machine tool; the difference between multiple support bases 7 lies in the length of their mounting surface to the grinding machine.

[0055] The implementation principle of a double-jaw center frame according to an embodiment of this application is as follows: the adjustment component 6 is zeroed in advance, and the drive component 4 is started so that the connecting rod 5 drives the first support rod and the second support to slide synchronously; the first support block 22 slides and abuts against the surface of the workpiece, and the clamping arm 33 rotates towards the workpiece under the action of the push arm 32, so that the second support block 34 abuts against the surface of the workpiece, thereby realizing the initial clamping of the workpiece; the operator further fine-tunes the clamping of the workpiece by rotating the adjustment knob 61.

[0056] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A double jaw center comprising a center body (1), a first jaw member (2) and a second jaw member (3) provided to the center body (1), and a drive assembly (4), characterized in that, Further comprising a connecting rod (5) connecting the first jaw member (2), the second jaw member (3) and the driving assembly (4), the driving assembly (4) drives the first jaw member (2) and the second jaw member (3) to move synchronously through the connecting rod (5); The first jaw member (2) comprises a first support shaft (21) slidingly arranged in the center frame body (1) and a first support block (22) arranged at the end of the first support shaft (21) and used for abutting against a workpiece, and the first support shaft (21) is provided with a first connecting hole (211) for inserting the connecting rod (5). The second jaw member (3) comprises a second support shaft (31) slidingly arranged in the center frame body (1), a pushing arm (32) arranged at the end of the second support shaft (31), a clamping arm (33) rotationally arranged in the center frame body (1) and a second support block (34) arranged on the clamping arm (33), and the second support shaft (31) is provided with a second connecting hole (311) for inserting the connecting rod (5), and the pushing arm (32) slidingly drives the clamping arm (33) to rotate. The center frame body (1) is provided with a clearance slot (16) for rotationally arranging the clamping arm (33).

2. A twin-paw centering support according to claim 1, characterized in that The driving assembly (4) comprises a piston rod (41), a piston head (42) arranged at one end of the piston rod (41) and a damper (43) arranged at the other end of the piston rod (41), the center frame body (1) is provided with a sealed cavity (11) for sealingly sliding the piston head (42), the piston rod (41) is provided with a piston connecting hole (411) for inserting the connecting rod (5), and a fixing shaft (412) fixedly connected with the connecting rod (5) is arranged on the inner wall of the piston connecting hole (411).

3. A twin-paw centering support according to claim 2, characterized in that The clamping arm (33) is provided with a rotating end (331) rotationally matched with the center frame body (1), the clamping arm (33) is provided with a sliding strip-shaped hole (332) on the side away from the rotating end (331), and the pushing arm (32) is provided with a fixed pin shaft (321) slidingly arranged in the sliding strip-shaped hole (332).

4. A twin jaw mandrel as claimed in claim 3, wherein, The clamping arm (33) is provided with a guide inclined surface (3331) for abutting against the end of the pushing arm (32), and the inclined direction of the guide inclined surface (3331) is parallel to the extension direction of the sliding strip-shaped hole (332).

5. A twin jaw mandrel as claimed in claim 4, wherein, The clamping arm (33) is provided with a matching arc surface (334) on the side away from the guide inclined surface (3331).

6. A twin jaw mandrel as claimed in claim 3, wherein, The first jaw member (2) and the second jaw member (3) are respectively arranged on the two sides of the piston rod (41), and the rotating end (331) and the piston rod (41) are correspondingly arranged.

7. A twin jaw mandrel as defined in claim 1 wherein, An adjusting assembly (6) for fine-tuning the first jaw member (2) and the second jaw member (3) is arranged on the outer side of the center frame body (1), the adjusting assembly (6) comprises an adjusting knob (61) connected with the first support shaft (21) or the second support shaft (31) and a detection member (62) for monitoring the adjusting distance.

8. A twin jaw mandrel as defined in claim 1 wherein, It also comprises a support base (7) for fixing to a machine tool, said central frame (1) having a notch (17) corresponding to said clearance slot (16), said support base (7) having a compensating surface (71) corresponding to said notch (17).

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