A workpiece chuck

Abstract

The present invention discloses a workpiece chuck, comprising a chuck body and at least three clamping jaws, wherein the clamping jaws are provided with a slider, and the chuck body is provided with a driving cylinder, wherein the driving cylinders are respectively connected to the sliders through a telescopic mechanism; the telescopic mechanism comprises a parallelogram telescopic connecting rod mechanism and a driving connecting rod, wherein the inner end of the parallelogram telescopic connecting rod mechanism is hinged to a central connecting block, and the outer end is hinged to the slider, the inner end of the driving connecting rod is connected to the driving cylinder, and the outer end is hinged to an upper hinge point or a lower hinge point of the parallelogram telescopic connecting rod mechanism. The driving cylinder of the present invention drives the parallelogram telescopic connecting rod mechanism to extend and retract through the driving connecting rod to achieve the tensioning of the clamping jaws, which not only greatly increases the stroke of the clamping jaws, but also can be used for clamping workpieces of various specifications, does not need to frequently replace the chuck on the conveyor line, reduces the workpiece clamping cost, and improves the processing efficiency of the workpiece, and the clamping jaws are retractable, the chuck is small in size, and the installation on the conveyor line is more convenient, which increases the application occasions of the chuck.

Description

Technical Field

[0001] The invention relates to a workpiece chuck, belonging to the technical field of workpiece clamping and conveying. Background Art

[0002] At present, three-jaw chucks are mainly used to clamp workpieces. Three-jaw chucks can be used to clamp cylindrical workpieces, such as brake discs. The brake discs need to have their surfaces processed during the processing, such as heating, spraying and other processes. The existing method is to set up a brake disc conveyor line, and the brake discs travel on the conveyor line to reach the corresponding workstations for corresponding processing operations, and the specific positioning of the brake discs on the conveyor line is achieved through the conveyor chuck.

[0003] The existing conveying chuck includes a chuck body, a piston arranged on the chuck body, a claw transmission member and a claw. The chuck body is provided with a claw slideway, the claw transmission member is connected with the piston, the claw and the claw transmission member cooperate with each other through a hook groove, the contact position between the claw transmission member and the claw is set obliquely, the vertical movement of the piston is converted into the radial movement of the claw through the claw transmission member, the vertical extension and contraction movement of the piston drives the claw transmission member to move up and down, and is converted into the radial movement of the claw on the chuck body, such as when the claw transmission member is extended under the action of the piston, the claw moves radially outward under the action of the claw transmission member, and the inner circle of the brake disc can be clamped, which is convenient for the surface treatment of the brake disc, the claw transmission member shrinks under the action of the piston, and the claw moves radially inward with the claw transmission member under the cooperation of the hook groove, and the claw can be in a retracted state. Since the conveying chuck is used to support and position the brake disc on the conveying line, the precision requirement for the conveying chuck is not high. Due to the limited stroke of the cylinder and the fact that the claw transmission member directly transmits the stroke of the cylinder to the claw, the claw stroke is basically corresponding to the cylinder stroke, resulting in a very small claw stroke of the conveying chuck, generally within 32 mm, resulting in only one type of brake disc being able to be clamped and positioned on a conveyor line, and being unable to adapt to brake discs 12 of various specifications and sizes. If brake discs of different specifications and sizes need to be clamped, it is necessary to replace it with a chuck whose claws can correspond to clamping large-sized brake discs. However, the replaced chuck also has the problem of small stroke. Therefore, it is necessary to purchase more conveying chucks in order to clamp brake discs of different specifications and sizes. This not only increases the processing cost, but also requires frequent replacement of chucks according to the sizes of different brake discs during the processing, which is time-consuming and labor-intensive, and will inevitably lead to a decrease in productivity. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a workpiece chuck which has a simple structure, is convenient to adjust, has a large stroke, is suitable for clamping workpieces of various specifications and sizes, reduces processing costs and improves processing efficiency.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a workpiece chuck, comprising a chuck body and at least three claws arranged on the chuck body, the chuck body is evenly provided with claw slideways, the claws are provided with sliders adapted to the claw slideways, the chuck body is provided with a driving cylinder for driving the claws to retract and extend, and the driving cylinders are respectively connected to the sliders through telescopic mechanisms;

[0006] The telescopic mechanism includes a parallelogram telescopic link mechanism and a driving link used to transmit the power of the driving cylinder to the parallelogram telescopic link mechanism and drive its telescopic action. The inner end of the parallelogram telescopic link mechanism is hinged to the central connecting block, and the outer end is hinged to the slider. The inner end of the driving link is connected to the driving rod of the driving cylinder, and the outer end is hinged to the upper hinge point or the lower hinge point of the parallelogram telescopic link mechanism.

[0007] The beneficial effects of the present invention are as follows: the driving cylinder drives the extension and retraction of the parallelogram telescopic linkage mechanism through the driving connecting rod, thereby realizing the tensioning of the clamping claws. The stroke of the clamping claws can select the number of telescopic rods of the parallelogram telescopic linkage mechanism according to the actual stroke requirements. The stroke of the driving cylinder is multi-stage amplified by the parallelogram telescopic linkage mechanism, which not only greatly increases the stroke of the clamping claws, but also can be used for clamping workpieces of various specifications. There is no need to frequently replace the chuck on the conveyor line, which reduces the workpiece clamping cost and improves the workpiece processing efficiency. Moreover, the chuck can be shrunk to reduce its occupied space in the chuck. The chuck is small in size and is more convenient to install on the conveyor line, which increases the application occasions of the chuck.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the parallelogram telescopic linkage mechanism is provided with an inner hinge center point and an outer hinge center point, the inner hinge center point is hinged to the central connecting block, the outer hinge center point is hinged to the slider, an intermediate hinge center point is provided between the inner and outer hinge center points, and the upper hinge point and the lower hinge point are respectively arranged above and below the intermediate hinge center point.

[0010] The beneficial effect of adopting the above further solution is that the connection between the parallelogram telescopic connecting rod mechanism and the hinged position between the central connecting block, the slider and the driving connecting rod is realized, so as to achieve the driving purpose of the driving cylinder to tighten the claws.

[0011] Furthermore, the central connecting block is provided with fork ears corresponding to the inner hinge center point, and the inner hinge center point is arranged between the fork ears.

[0012] The beneficial effect of adopting the above further solution is that the number of the parallelogram telescopic connecting rod mechanisms is consistent with the number of the claws, and the connection between the parallelogram telescopic connecting mechanism and the central connecting block can be achieved through the fork ears.

[0013] Furthermore, the driving connecting rod is connected to the driving rod of the driving cylinder via a connecting joint, and the connecting joint is provided with a joint ear plate corresponding to the hinged connection with the driving connecting rod.

[0014] The beneficial effect of adopting the above further solution is that the driving connecting rod is connected to the driving rod of the driving cylinder through the connecting joint, and the connecting joint can be installed on the driving rod by bolts, which is convenient for installation and maintenance.

[0015] Furthermore, there are two driving connecting rods, which are arranged in parallel, and the two driving connecting rods are arranged on both sides of the joint ear plate through hinge pins.

[0016] The beneficial effect of adopting the above further solution is that the driving connecting rod transmits power more stably and reliably.

[0017] Furthermore, the chuck body includes a chuck mounting plate and a chuck mounting seat arranged on the chuck mounting plate, the claw slideways are evenly arranged on the chuck mounting seat, and the driving cylinder is installed on the chuck mounting plate.

[0018] The beneficial effect of adopting the above further solution is that it is easy to install and position the slider and the drive cylinder on the chuck.

[0019] Furthermore, the chuck mounting seat is mounted on the chuck mounting plate by fastening bolts.

[0020] The beneficial effect of adopting the above further solution is that the installation between the mounting seat of the chuck body and the mounting plate is achieved.

[0021] Furthermore, the chuck body is mounted on the workbench by means of locking bolts, and mounting holes for mounting the locking bolts are provided on the chuck mounting plate and the chuck mounting seat.

[0022] The beneficial effect of adopting the above further solution is that after the chuck is installed, it can be installed on the workbench through the locking bolts to achieve the positioning installation of the chuck.

[0023] Furthermore, the sliding block is provided with a reference hole for connecting the claw.

[0024] The beneficial effect of adopting the above further solution is that the clamping claw is mounted on the slider and positioned accurately to improve the positioning accuracy of the clamping claw, and then the clamping claw is stably mounted on the slider by bolts.

[0025] Furthermore, a protrusion is provided on the upper part of the claw.

[0026] The beneficial effect of adopting the above further solution is that when the workpiece is placed on the clamping claw, the workpiece to be clamped is limited to prevent the workpiece from slipping out of the upper part of the clamping claw.

[0027] Furthermore, grooves are respectively provided on both sides of the slideway, and bosses adapted to the claw slideway are provided on both sides of the sliding block.

[0028] The beneficial effect of adopting the above further solution is that accurate guidance of the radial movement of the claw is achieved through the cooperation between the boss and the groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention when the clamping claw is in an open state;

[0030] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention in an open state;

[0031] Figure 3 This is a schematic diagram of the structure of the present invention in an open state without the chuck mounting seat;

[0032] Figure 4 It is a schematic diagram of the connection structure between the clamping claw and the telescopic connecting rod mechanism in the open state of the present invention;

[0033] Figure 5 It is a structural schematic diagram of the clamping jaws of the present invention in a retracted state;

[0034] Figure 6 It is a schematic diagram of the cross-sectional structure of the present invention in a contracted state;

[0035] Figure 7 It is a schematic diagram of the structure of the present invention with the chuck mounting seat removed in the contracted state;

[0036] Figure 8 It is a structural schematic diagram of the slider of the present invention;

[0037] Fig. 9 It is a schematic diagram of the structure of brake discs of different specifications clamped by the present invention;

[0038] In the figure, 1, chuck body; 101, slideway; 102, chuck mounting seat; 103, chuck mounting plate; 2, claw; 201, protrusion; 3, slider; 301, boss; 302, reference hole; 4, parallelogram telescopic connecting rod mechanism; 401, inner hinge center point; 402, outer hinge center point; 403, upper hinge point; 404, lower hinge point; 5, driving connecting rod; 6, connecting joint; 601, joint ear plate; 7, central connecting block; 701, fork ear; 8, driving cylinder; 9, locking bolt; 10, fastening bolt; 11, throttle valve; 12, brake disc. DETAILED DESCRIPTION

[0039] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0040] like Figure 1-Figure 9 As shown, a workpiece chuck comprises a chuck body 11 and at least three claws 2 arranged on the chuck body 1, the chuck body 1 is evenly provided with claw slideways 101, the claws 2 are provided with sliders 3 adapted to the claw slideways 101, the chuck body 1 is provided with a driving cylinder 8 for driving the claws 2 to retract and expand, and the driving cylinder 8 is respectively connected to the sliders 3 through a telescopic mechanism;

[0041] The telescopic mechanism includes a parallelogram telescopic link mechanism 4 and a driving link 5 for transmitting the power of the driving cylinder 8 to the parallelogram telescopic link mechanism 4 and driving its telescopic action. The inner end of the parallelogram telescopic link mechanism 4 is hinged to the central connecting block 7, and the outer end is hinged to the slider 3. The inner end of the driving link 5 is connected to the driving rod of the driving cylinder 8, and the outer end is hinged to the upper hinge point 403 or the lower hinge point 404 of the parallelogram telescopic link mechanism 4.

[0042] The parallelogram telescopic link mechanism 4 is provided with an inner hinge center point 401 and an outer hinge center point 402, wherein the inner hinge center point 401 is hinged to the central connection block 7, and the outer hinge center point 402 is hinged to the slider 3, and an intermediate hinge center point is provided between the inner hinge center point and the outer hinge center point, and the upper hinge point 403 and the lower hinge point 404 are respectively arranged above and below the intermediate hinge center point. The connection of the hinged position between the parallelogram telescopic link mechanism 4 and the central connection block 7, the slider 3 and the driving link 5 is realized, so as to achieve the purpose of tensioning the claw 2 by the driving cylinder 8.

[0043] The central connection block 7 is provided with fork ears 701 corresponding to the inner hinge center point 401, and the inner hinge center point 401 is arranged between the fork ears 701. The central connection block 7 is provided with fork ears 701 with the same number as the claws 2. The number of the parallelogram telescopic connecting rod mechanism is the same as the number of the claws, and the connection between the parallelogram telescopic connecting mechanism and the central connection block can be achieved through the fork ears.

[0044] The driving connecting rod 5 is connected to the driving rod of the driving cylinder 8 through the connecting joint 6, and the connecting joint 6 is provided with a joint ear plate 601 corresponding to the hinged connection with the driving connecting rod 5. The driving connecting rod 5 is connected to the driving rod of the driving cylinder 8 through the connecting joint 6, and the connecting joint 6 is provided with a joint ear plate 601 with the same number as the claws 2. The connecting joint 6 can be installed on the driving rod by bolts, which is convenient for installation and maintenance.

[0045] There are two driving connecting rods 5, which are arranged in parallel. The two driving connecting rods 5 are arranged on both sides of the joint ear plate 601 through hinge pins. The driving connecting rod 5 transmits the cylinder power to the corresponding parallelogram telescopic connecting rod mechanism, and the power transmission is more stable and reliable.

[0046] The chuck body 1 includes a chuck mounting plate 103 and a chuck mounting seat 102 arranged on the chuck mounting plate 103, the claw slideways 101 are evenly arranged on the chuck mounting seat 102, and the drive cylinder 8 is installed on the chuck mounting plate 103. This facilitates the installation and positioning of the slider 3 and the drive cylinder 8 on the chuck.

[0047] The chuck mounting seat 102 is mounted on the chuck mounting plate 103 by means of the fastening bolts 10, so as to realize the installation between the mounting seat of the chuck body 1 and the mounting plate.

[0048] The chuck body 1 is mounted on the workbench by means of locking bolts 9, and mounting holes for mounting the locking bolts 9 are provided on the chuck mounting plate 103 and the chuck mounting seat 102. After the chuck is mounted, it can be mounted on the workbench by means of locking bolts 9 to achieve positioning and mounting of the chuck.

[0049] The slider 3 is provided with a reference hole 302 for connecting the claw 2. The claw 2 is mounted on the slider 3 to accurately position the claw 2, and then the claw 2 is stably mounted on the slider 3 by bolts.

[0050] The upper part of the clamping jaw 2 is provided with a protrusion 201. When the workpiece is placed on the clamping jaw 2, the workpiece to be clamped is limited to prevent the workpiece from slipping out of the upper part of the clamping jaw 2.

[0051] Grooves are respectively provided on both sides of the slideway 101 , and bosses 301 adapted to the slideway 101 of the claw 2 are provided on both sides of the slider 3 .

[0052] The driving cylinder 8 can be an air cylinder. The air inlet and the air outlet of the telescopic air cylinder are respectively connected to the throttle valve 11 to achieve effective control of the air flow velocity, so that the clamping claws can move smoothly to achieve the opening and clamping actions.

[0053] The driving cylinder may also be a hydraulic cylinder.

[0054] The functions of the clamping jaw 2 include clamping the workpiece and supporting the workpiece. It is divided into a clamping part and a supporting part, and the specific size can be adjusted. The clamping jaw 2 is precisely mounted on the slider 3. The stroke of the slider 3 is the stroke of the clamping jaw 2. For different workpieces, the shape of the clamping jaw 2 can be changed to adapt to the workpiece. There are bosses 301 on both sides of the slider 3 corresponding to the grooves on the mounting seat. The precise matching realizes the control of its degree of freedom. There are three clamping jaws, and the slider is provided with three corresponding ones. The slider 3 can only move linearly along the direction of the groove, and the moving distances of the three sliders 3 are consistent. There are two reference holes 302 on the slider 3, which are used to accurately position the clamping jaw 2 to ensure the positioning accuracy of the clamping jaw 2. Of course, according to the structure of the existing chuck, a chuck with a large stroke can also be made. Although the chuck without a large stroke is solved, the increase in the stroke of the clamping jaw will cause the overall volume of the chuck to become larger, which will limit the application place of the chuck and its use space. For example, it will affect the installation of parts on the workstation and cannot be used on the conveyor line of the brake disc. Each slider 3 of the present invention is connected to a parallelogram telescopic linkage mechanism 4, and each parallelogram telescopic linkage mechanism 4 includes a plurality of hinged telescopic rods. According to the stroke requirement, a suitable number of telescopic rods can be selected to increase the corresponding stroke. The three parallelogram telescopic linkage mechanisms 4 are connected together through a central connecting block 7, and the driving thereof is connected to the piston rod of the cylinder through a driving connecting rod 5 and a connecting joint 6, so that the synchronous movement of the three parallelogram telescopic linkage mechanisms 4 and the three claws 2 can be realized, and the claws can move forward and backward together, thereby achieving the purpose of a large stroke of the claws. One chuck can be used for clamping brake discs of various specifications and sizes, and the chuck itself is small in size and occupies little space, which increases the use of the chuck.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A workpiece chuck, comprising a chuck body and at least three claws arranged on the chuck body, wherein the chuck body is evenly provided with claw slideways, and the claws are provided with sliders adapted to the claw slideways, characterized in that: The chuck body is provided with a driving cylinder for driving the clamping claws to retract and expand, and the driving cylinder is respectively connected to the sliders through a telescopic mechanism; The telescopic mechanism includes a parallelogram telescopic link mechanism and a driving link used to transmit the power of the driving cylinder to the parallelogram telescopic link mechanism and drive its telescopic action. The inner end of the parallelogram telescopic link mechanism is hinged to the central connecting block, and the outer end is hinged to the slider. The inner end of the driving link is connected to the driving rod of the driving cylinder, and the outer end is hinged to the upper hinge point or the lower hinge point of the parallelogram telescopic link mechanism.

2. The workpiece chuck according to claim 1, characterized in that: The parallelogram telescopic connecting rod mechanism is provided with an inner hinge center point and an outer hinge center point, the inner hinge center point is hinged to the central connecting block, the outer hinge center point is hinged to the slider, an intermediate hinge center point is provided between the inner and outer hinge center points, and the upper hinge point and the lower hinge point are respectively arranged above and below the intermediate hinge center point.

3. The workpiece chuck according to claim 2, characterized in that: The central connecting block is provided with fork ears corresponding to the inner hinge center point, and the inner hinge center point is arranged between the fork ears.

4. The workpiece chuck according to claim 1, 2 or 3, characterized in that: The driving connecting rod is connected to the driving rod of the driving cylinder through a connecting joint, and the connecting joint is provided with a joint ear plate corresponding to the hinged connection with the driving connecting rod.

5. The workpiece chuck according to claim 4, characterized in that: There are two driving connecting rods, which are arranged in parallel. The two driving connecting rods are arranged on both sides of the joint ear plate through hinge pins.

6. The workpiece chuck according to claim 1, characterized in that: The chuck body comprises a chuck mounting plate and a chuck mounting seat arranged on the chuck mounting plate, the claw slideways are evenly arranged on the chuck mounting seat, and the driving cylinder is mounted on the chuck mounting plate.

7. The workpiece chuck according to claim 6, characterized in that: The chuck body is mounted on the workbench through locking bolts, and mounting holes for mounting the locking bolts are provided on the chuck mounting plate and the chuck mounting seat.

8. The workpiece chuck according to claim 1, characterized in that: The sliding block is provided with a reference positioning hole for connecting the clamping claw.

9. The workpiece chuck according to claim 1, characterized in that: A protrusion is arranged on the upper part of the claw.

10. The workpiece chuck according to claim 1, characterized in that: Grooves are respectively arranged on both sides of the slideway, and bosses matched with the claw slideway are arranged on both sides of the sliding block.

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