CN114799975A

CN114799975A - Disc clamping device

Info

Publication number: CN114799975A
Application number: CN202110125485.7A
Authority: CN
Inventors: 张庆轩
Original assignee: Hitachi Anstamo Automotive Systems Suzhou Co ltd
Current assignee: Hitachi Anstamo Automotive Systems Suzhou Co ltd
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2022-07-29

Abstract

The invention relates to a disc clamping device (100) comprising: a first disc (10), a second disc (20) and a third disc (30) coaxially superposed on each other and capable of rotating independently; at least one jaw (11) mounted to the first disc (10); and a driving cylinder (40), the driving cylinder (40) drives the second disk (20) between the first disk (10) and the third disk (30) to make rotary motion, the second disk (20) is matched with the first disk (10) to convert the rotary motion provided by the driving cylinder (40) into linear motion of the jaws (11) towards the center of the disk or away from the center of the disk, wherein each of at least one jaw (11) is provided with a sliding block part (12) and a sliding rail part (13), and the sliding block part (12) and the sliding rail part (13) are matched with each other to enable the jaws to move between an opening position and a clamping position. The invention thus provides a disc clamping device (100) that prevents the jaws from jamming or even jamming within the guide slots.

Description

Disc clamping device

Technical Field

The present invention relates to a disk chucking apparatus, and more particularly, to a disk chucking apparatus that can be quickly switched.

Background

Clamping devices commonly used in the mechanical arts typically include pneumatically driven clamping devices, motor driven clamping devices, hydraulically driven clamping devices, and the like. These clamping devices convert the driving force into a clamping force by means of gears, worm gears, cam grooves, etc.

For example, chinese patent application CN111468750A, filed 24/4/2020 by zhhaiglili smart equipment ltd, discloses a clamp. This anchor clamps include: the base body is provided with a mounting cavity and a plurality of mounting grooves communicated with the mounting cavity; the clamping assemblies are arranged in one-to-one correspondence to the mounting grooves, and at least part of each clamping assembly is slidably arranged in the corresponding mounting groove; a plurality of clamping components surround to form a clamping space; the rotary table is positioned in the mounting cavity and provided with a plurality of arc-shaped concave parts, a plurality of clamping assemblies are arranged in one-to-one correspondence with the arc-shaped concave parts, and at least part of each clamping assembly is slidably arranged in the corresponding arc-shaped concave part; and the driving device is in driving connection with the rotary table to drive the rotary table to rotate so as to drive each clamping assembly to slide along the corresponding mounting groove through the rotary table, and further adjust the size of the clamping space.

However, the above conventional clamping device generally has the following problems:

(i) when the jaws of the clamping device are clamped, the linearity of the jaws in linear motion is determined by the gap between the jaws and the guide groove. When the linearity is high, the clearance between the clamping jaw and the guide groove is very small, and the clamping jaw can be blocked or even deadly when reciprocating in the guide groove, so that the normal operation of the clamping device is seriously influenced. To avoid this, machining accuracy of each part needs to be increased, which in turn leads to a corresponding increase in production cost.

(ii) The clamping force of the clamping jaws of the clamping device is basically the same as or even smaller than the driving force. At the moment, the transmission ratio is less than or equal to 1: 1. therefore, the operator needs to exert a large force to perform the work of clamping.

(iii) Because the clamping device needs to be installed on the equipment to perform the clamping operation, the installation process between the clamping device and the equipment is time-consuming, and the clamping device cannot be flexibly and quickly switched between an installation in-place state and a separation state.

(iv) Because there is no signal indicating whether the probe jaws are in a clamped condition, the operator cannot accurately determine whether the workpiece has been securely clamped to the jaws.

Therefore, the design of a disc clamping device for preventing the clamping jaws from being locked or even dead in the guide grooves is urgently needed.

Disclosure of Invention

The invention aims to provide a disc clamping device for preventing clamping claws from being blocked or even dead in a guide groove.

The present invention relates to a disk chucking apparatus, including:

a first disk, a second disk and a third disk coaxially stacked with each other and independently rotatable;

at least one jaw mounted to the first disk; and

the driving cylinder drives a second disc between the first disc and the third disc to rotate, the second disc is matched with the first disc so as to convert the rotation motion provided by the driving cylinder into the linear motion of the clamping jaws towards the center of the disc or away from the center of the disc,

wherein each of the at least one jaws is equipped with a slider part and a slide part, which cooperate with each other to enable the jaws to move between an open position and a clamping position.

Preferably, the driving cylinder is provided with a cylinder link connected to the second disc through a cylinder link through-hole formed on the first disc.

Preferably, the rail portion is fixed to the first disc, and the slider portion engaged with the rail portion is provided with a jaw protruding toward the center of the disc and a jaw driving link protruding toward the second disc, the jaw driving link passing through a jaw driving link through-hole formed on the first disc and a jaw driving link sliding arc groove formed on the second disc.

More preferably, the jaw driving link through hole is designed as a long hole extending in a radial direction of the first disc, and the jaw driving link sliding arc groove is designed such that a distance from a center of the disc to each point on a center line thereof varies monotonously, wherein a first end of the jaw driving link sliding arc groove is a minimum distance from the center of the disc, and a second end of the jaw driving link sliding arc groove is a maximum distance from the center of the disc.

Preferably, the first disc, the second disc and the third disc are all provided with a circle center hollow part, the third disc is further provided with a step part around the circle center hollow part, the step part is provided with an outer diameter and an inner diameter, the outer diameter is the same as the diameter of the circle center hollow part of the second disc, and the inner diameter is the same as the diameter of the circle center hollow part of the first disc.

More preferably, the step portion of the third disc and the first disc are respectively provided with at least one fixing hole at positions corresponding to each other to fix the first disc and the third disc with respect to each other.

In another preferred embodiment, the drive cylinder is fixed to the first disc at a circumferential position and is equipped with a plug-in connection with an external gas source for supplying compressed gas from the external gas source to the drive cylinder.

In a further preferred embodiment, one of the first, second and third disks is provided with a reference detector in a circumferential direction, the reference detector being aligned with the open state sensor when the jaws are located at the open position; when the claw is located at the clamping position, the reference detection piece is aligned with the clamping state sensor.

In a further preferred embodiment, the second disc forms at least one hollow.

In a further preferred embodiment, the first and/or third disc is circumferentially distributed with at least one quick-change screw hole, which is a gourd-shaped hole having a large end and a small end, such that the quick-change screw can be removed from the quick-change screw hole when located in the large end and cannot be removed from the quick-change screw hole when located in the small end.

The disc clamping device according to the present invention has advantages in that:

(i) according to the disc clamping device, the clamping jaws move linearly along the sliding rail part, the friction force is extremely small, the reciprocating movement precision can even reach a micron level, and the problem that the clamping jaws are easy to clamp or even block in the guide groove in the traditional clamping device is effectively solved. In addition, the machining precision requirement of each part is low, and the corresponding increase of the production cost cannot be caused.

(ii) According to the disc clamping device, when the driving cylinder is positioned at the extending end for clamping, the driving cylinder and the second disc form a dead angle structure. At the moment, the clamping force applied to the clamping jaws is large, the clamping jaws are not easy to open, and the clamped workpieces can be effectively prevented from falling off unexpectedly.

(iii) The disc clamping device is provided with the quick-change screw hole in the form of the gourd hole, and when the disc clamping device is required to be installed on equipment, the quick-change screw can be moved into the small end of the gourd hole; when the disc clamping device needs to be taken down from the equipment, the quick-change screw can be moved into the large end of the gourd hole, so that the disc clamping device can be flexibly and quickly switched between a mounting in-place state and a separation state, and the operating efficiency of operators is improved.

(iv) The disc clamp apparatus according to the present invention is equipped with an open state sensor and a clamping state sensor to output an open state signal when the jaws are in an open state and a clamping state signal when the jaws are in a clamping state, so that an operator can accurately know whether a workpiece has been firmly clamped to the jaws.

Drawings

To further illustrate the structure and operation of the disc clamp assembly of the present invention, the present invention will be described in detail with reference to the accompanying drawings and detailed description, wherein:

FIG. 1 is a perspective view of a disc clamp according to the present invention;

fig. 2A is a perspective view of a first disk constituting the disk chucking apparatus of the present invention;

fig. 2B is a plan view of a first disk constituting the disk chucking apparatus of the present invention;

fig. 3A is a perspective view of a second disk constituting the disk chucking apparatus of the present invention;

fig. 3B is a plan view of a second disk constituting the disk chucking apparatus of the present invention;

fig. 4A is a perspective view of a third disc constituting the disc clamp apparatus of the present invention;

fig. 4B is a plan view of a third disc constituting the disc clamp apparatus of the present invention;

fig. 5A is a schematic view of the disc clamp apparatus according to the present invention in an open state, with the first disc and the claws, slider portions, and rail portions mounted to the first disc omitted for clarity;

FIG. 5B is a view similar to FIG. 5A but showing the disc clamp in a clamped condition; and

fig. 6A and 6B show the principle of the driving cylinder forming a dead-angle structure with the second disc.

Reference numerals

10 first disc

11 claw

12 slide block part

13 slide rail part

14 claw driving connecting rod

15 claw driving connecting rod through hole

16. 32 quick-change screw hole

17. 33 fixing hole

18 cylinder connecting rod through hole

20 second disc

21 jack catch driving connecting rod sliding arc groove

22 fastening screw hole

23 hollowed part

30 third disc

31 step part

40 driving cylinder

41 piston rod

42 cylinder connecting rod

43. 44 plug-in connector

50 benchmark detection piece

51 open state sensor

52 clamping state sensor

100 disc clamping device

Detailed Description

The structure and the operation of the disc clamp apparatus according to the present invention will be described with reference to the accompanying drawings, in which like elements are designated by like reference numerals.

It should be understood that the embodiments described in this specification cover only a portion of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments described in the description without any inventive step, are intended to be within the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

For example, the terms "including" and "having," as well as any variations thereof, used in the description and claims of this application are intended to cover a non-exclusive inclusion. As used in the specification and claims of this application, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "first," "second," and "third," as used in the description and claims of this application, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Fig. 1 shows a disc clamping device 100 according to the present invention, and it can be seen that the disc clamping device 100 includes three discs coaxially stacked on each other and independently rotatable, the discs being stacked in contact with each other and having disc centers located on the same line. Furthermore, the disks are independently rotatable about the line and preferably have the same diameter. Of course, it is also possible for a person skilled in the art to design the diameters of the three discs to be different from each other.

As shown in fig. 1, the three disks of the disk clamping device 100 are a first disk 10, a second disk 20 and a third disk 30 from top to bottom, wherein the second disk 20 is located between the first disk 10 and the third disk 30, and is therefore also referred to as an intermediate disk. The specific structure of these disks can be referred to fig. 2A to 4B.

The first disc 10 is provided with at least one and preferably three jaws 11. The claws 11 are evenly distributed around the disc centre of the first disc 10. That is, when three claws 11 are mounted on the first disc 10, the three claws 11 are arranged at an angle of 120 ° to each other.

Each jaw 11 is equipped with a slider portion 12 and a slide rail portion 13, respectively, the slider portion 12 and the slide rail portion 13 cooperating with each other to enable the jaws 11 to move between an open position and a clamping position. Specifically, the rail portion 13 is fixed to the first disc 10 by means of two or more screws, and the slider portion 12 engaged with the rail portion 13 is provided with the claws 11 and the claw driving links 14, wherein the claws 11 protrude toward the disc center of the first disc 10, and the claw driving links 14 protrude downward, i.e., toward the second disc, pass through the claw driving link through holes 15 formed on the first disc 10 and the claw driving link sliding arc grooves 21 formed on the second disc 20, and are movable in the claw driving link through holes 15 and the claw driving link sliding arc grooves 21.

Of course, it is obvious to those skilled in the art that designing the slider portion 13 and the jaw 11 as an integral part, and even designing the slider portion 13, the jaw drive link 14 and the jaw 11 together as an integral part, are modifications that are easily conceivable in the art, and therefore should be considered to fall within the scope of the present invention.

The driving cylinder 40 is disposed at a side of the first disk 10 in a circumferential direction of the first disk 10. As shown in fig. 2B, a portion of the circumference of the first disk 10 is flattened into a flat surface, and thus the driving cylinder 40 may be mounted to the flat surface by means of two or more screws.

The driving cylinder 40 is provided with a piston rod 41 in its expansion and contraction direction, the piston rod 41 is pivotally connected to a cylinder link 42, and the cylinder link 42 forms an angle of approximately 90 ° with the piston rod 41, passes through a cylinder link through-hole 18 formed in the first disc 10, and is connected to the second disc 20. As shown in fig. 3A and 3B, the second disk 20 is designed with a fastening screw hole 22, and the end of the cylinder rod 42 is also formed with a screw thread, so as to allow the cylinder rod 42 to be screwed into the fastening screw hole 22 and thereby fixedly connected to the second disk 20. Of course, other means of securing the cylinder rod 42 to the second disc 20 may be devised on the second disc 20, as would be readily apparent to one of ordinary skill in the art.

The driving cylinder 40 is provided with a pair of plug-in

connectors

43 and 44 connected to an external air source (not shown) in a direction perpendicular to its extension and retraction direction, the pair of plug-in

connectors

43 and 44 being quickly connectable to a corresponding pair of plug-in connectors associated with the external air source to supply the driving cylinder 40 with compressed air from the external air source.

Therefore, after compressed air from an external air source is introduced into the driving cylinder 40, the driving cylinder 40 drives the piston rod 41 in the extending direction, and drives the second disk 20 to rotate around the disk center thereof by the cylinder connecting rod 42. The second disc 20 cooperates with the first disc 10 in such a way as to convert the rotary motion imparted to the second disc 20 by the driving cylinder 40 into a rectilinear motion of the jaws 11 towards or away from the centre of the disc, namely: the jaw driving link through-hole 15 is designed as a long hole extending in a radial direction of the first disc 10 (i.e., in a direction toward the center of the disc), and the jaw driving link sliding arc groove 21 is designed such that a distance from the center of the second disc 20 at each point on the center line thereof varies monotonically, wherein a first end of the jaw driving link sliding arc groove 21 has a minimum distance from the center of the disc of the second disc 20 and a second end of the jaw driving link sliding arc groove 21 has a maximum distance from the center of the disc of the second disc 20.

With the above structure, when the driving cylinder 40 drives the cylinder link 42 and drives the second disk 20 to rotate, the second disk 20 starts to rotate counterclockwise around the disk center. At this time, the state of the sliding arc groove 21 of the jaw driving link is changed, and the jaw driving link 14 starts to be pressed, so that the jaw 11 moves in the through hole 15 of the jaw driving link and drives the slider part 12 to move together on the slide rail part 13 along the radial direction towards the circle center, and the jaw 11 moves from the open position to the clamping position.

As shown in fig. 2A to 4B, the center portions of the first disc 10, the second disc 20, and the third disc 30 are all hollow, or the discs are all opened with a hollow center. Further, as shown in fig. 4A and 4B, the third disc 30 is further formed with a step 31 around the center hollow portion thereof, the step 31 being in the shape of a hollow cylinder having an outer diameter and an inner diameter, wherein the outer diameter of the hollow cylinder is the same as the diameter of the center hollow portion of the second disc 20, and the inner diameter of the hollow cylinder is the same as the diameter of the center hollow portion of the first disc 10. Thus, the second disc 20 may be nested around and enclose the step 31. Further, the height of the step 31 is designed to be the same as the thickness of the second disk. Therefore, the top surface of the second cylinder 20 is flush with the top surface of the step 31 after being fitted on the step 31.

At least one, preferably three fixing

holes

17, 33 are provided on the step 31 of the third disc 30 and the first disc 10, respectively, at positions corresponding to each other, and the first disc 10 and the third disc 30 can be fixed with respect to each other using the same number of fasteners.

As shown in fig. 3A and 3B, the second disk 20 also defines at least one cutout 23. The hollow portion 23 serves to reduce the mass of the second disk 20 as much as possible without affecting the layout of the jaw driving link sliding arc groove 21 and the fastening screw hole 22, thereby reducing the manufacturing cost thereof.

As shown in fig. 4B, the third disc 30 has at least one, preferably three quick-change screw holes 32 distributed along the circumferential direction. The quick-change screw hole 32 is an oval hole as a whole, but is partially formed at one end thereof with an inwardly projecting stepped edge, thereby forming a gourd-shaped hole having a large end and a small end. The quick-change screw may be placed into the quick-change screw hole 32. When the quick-change screw is located in the large end of the gourd-shaped hole, the quick-change screw can be taken out of the quick-change screw hole 32; when the quick-change screw is located in the small end of the gourd-shaped hole, it cannot be removed from the quick-change screw hole 32.

When the disc clamping device 100 needs to be fixed on equipment, the quick-change screw can be moved into the small end of the gourd hole; when it is desired to remove the disc clamp 100 from the apparatus, the quick-change screw may be moved into the large end of the gourd hole, thereby enabling the disc clamp 100 to be flexibly switched between the mounted-in-place and the detached state. In addition, when the quick-change screw is switched, the quick-change screw only needs to be screwed up without being completely disassembled, so that the time for disassembling the quick-change screw is saved, and the operating efficiency of operators is improved.

In order to cooperate with moving the quick-change screws, corresponding oblong holes are also provided in the first disc 10 at positions corresponding to the quick-change screw holes 32 of the third disc 30. Alternatively, one skilled in the art may exchange the gourd holes of the third disc 30 with the elliptical holes of the first disc 10. Such variations should be known to those of ordinary skill in the art.

Fig. 5A and 5B are schematic views of a disc clamp apparatus according to the present invention in an open state and a clamped state, respectively. It can be seen that a reference detecting member 50 is provided in a circumferential direction on one of the first, second, and

third disks

10, 20, and 30 (e.g., the first disk 10). For example, the reference detector 50 may be a screw attached to a side of the disk, or a bump or the like protruding outward from the disk.

The reference detector 50 is designed such that when the jaws 11 are in the open position, the reference detector 50 is aligned with the open state sensor 51; when the jaws 11 are in the clamped position, the reference detector 50 is aligned with the clamping status sensor 52. In this way, the open state sensor 51 may output an open state signal when the jaws 11 are in the open state, and the clamp state sensor 52 may output a clamp state signal when the jaws 11 are in the clamp state, so that the operator accurately knows whether the workpiece has been clamped firmly to the jaws 11.

The open state sensor 51 and the clamping state sensor 52 may be fixed to the equipment to which the disc clamping apparatus 100 is to be mounted, or in any other suitable location.

Fig. 6A and 6B illustrate the principle of the driving cylinder 40 forming a blind spot structure with the second disk 20.

The disc clamping device 100 forms a dead angle structure with the second disc 20 when the driving cylinder 40 is clamped at the extending end. At this time, the jaw 11 receives a large clamping force and is not easily opened, and the clamped workpiece can be effectively prevented from being undesirably dropped.

Through force analysis, the counterforce F of the claw 11 can be decomposed into F1 and F2.

Since F1 is F × sin θ, F1 is smaller as θ is smaller.

Continuing to resolve f1, where f is the force pushing the piston rod 41 to retract, we get:

f1＝F×cosα；

f＝F×sinθ×cosα；

by properly adjusting the two angles θ and α, f eventually becomes too small to push the piston rod 41 to retract, thereby forming a dead-center state. In short, the reaction force is small, and the driving force is not large, so that the bicycle is in an unopened state.

Fig. 6A shows the disc clamping device 100 in a clamped state, in which there are four fulcrums, namely, fulcrums 1 to 4, wherein the fulcrums 1 to 3 are fulcrums with a rotating shaft, and the fulcrum 4 is a central point of the disc. Thus, the reaction force is decomposed twice, and thus is greatly reduced, improving the clamping effect of the disc clamp apparatus. In contrast, the conventional clamping device has only the fulcrums 2 to 4, and thus its reaction force is decomposed only once, and cannot form a dead-angle structure such as the present invention.

Although the structure and operation of the disc clamp apparatus of the present invention have been described in connection with the preferred embodiments, it will be understood by those skilled in the art that the above examples are illustrative only and are not to be construed as limiting the invention. Therefore, modifications and variations of the present invention may be made within the true spirit and scope of the claims, and these modifications and variations are intended to fall within the scope of the claims of the present invention.

Claims

1. A disc clamping device (100) comprising:

a first disc (10), a second disc (20) and a third disc (30) coaxially superposed on each other and capable of rotating independently;

at least one jaw (11) mounted to the first disc (10); and

a driving cylinder (40), wherein the driving cylinder (40) drives the second disk (20) between the first disk (10) and the third disk (30) to rotate, the second disk (20) is matched with the first disk (10) to convert the rotation motion provided by the driving cylinder (40) into the linear motion of the jaws (11) towards the center of the disk or away from the center of the disk,

wherein each of said at least one jaw (11) is equipped with a slider part (12) and a slide rail part (13), said slider part (12) and said slide rail part (13) cooperating with each other to enable said jaw to move between an open position and a clamping position.

2. The disc clamp apparatus (100) according to claim 1, wherein the driving cylinder (40) is provided with a cylinder link (42), the cylinder link (42) being connected to the second disc (20) through a cylinder link through-hole (18) formed on the first disc (10).

3. The disc clamp apparatus (100) according to claim 1, wherein the rail portion (13) is fixed to the first disc (10), and the slider portion (12) engaged with the rail portion (13) is provided with a jaw (11) protruding toward the center of the disc and a jaw driving link (14) protruding toward the second disc (20), the jaw driving link (14) passing through a jaw driving link through-hole (15) formed on the first disc (10) and a jaw driving link sliding arc groove (21) formed on the second disc (20).

4. The disc chucking apparatus (100) of claim 3, wherein the jaw driving link through-hole (15) is designed as a long hole extending in a radial direction of the first disc (10), and the jaw driving link sliding arc groove (21) is designed such that a distance from a center of the disc to each point on a center line thereof monotonously changes, wherein a first end of the jaw driving link sliding arc groove (21) has a minimum distance from the center of the disc and a second end of the jaw driving link sliding arc groove (21) has a maximum distance from the center of the disc.

5. The disc clamping device (100) according to claim 1, wherein the first disc (10), the second disc (20) and the third disc (30) are each provided with a circular center hollow portion, the third disc (30) is further formed with a step portion (31) around the circular center hollow portion thereof, the step portion (31) has an outer diameter and an inner diameter, the outer diameter is the same as the diameter of the circular center hollow portion of the second disc (20), and the inner diameter is the same as the diameter of the circular center hollow portion of the first disc (10).

6. The disc clamping device (100) according to claim 5, wherein the step portion (31) of the third disc (30) and the first disc (10) are respectively provided with at least one fixing hole (17, 33) at positions corresponding to each other to fix the first disc (10) and the third disc (30) with respect to each other.

7. Disc clamping device (100) according to claim 1, characterised in that the drive cylinder (40) is fixed to a circumferential position of the first disc (10) and is equipped with a plug-in connection (43, 44) with an external gas source for supplying compressed gas from the external gas source to the drive cylinder (40).

8. The disc clamping device (100) according to claim 1, wherein one of the first disc (10), the second disc (20) and the third disc (30) is provided with a reference detecting member (50) in a circumferential direction, the reference detecting member (50) being aligned with an open state sensor (51) when the jaws (11) are located at the open position; when the jaws (11) are in the clamping position, the reference detection member (50) is aligned with a clamping state sensor (51).

9. Disc clamping device (100) according to claim 1, characterised in that said second disc (20) forms at least one hollow (23).

10. Disc clamping device (100) according to claim 1, wherein the first disc (10) and/or the third disc (30) is circumferentially distributed with at least one quick-change screw hole (16, 32), the quick-change screw hole (16, 32) being a gourd-shaped hole having a large end and a small end, such that a quick-change screw can be extracted from the quick-change screw hole (16, 32) when located in the large end and cannot be extracted from the quick-change screw hole (16, 32) when located in the small end.