CN111571283A

CN111571283A - Cylindrical gear clamp

Info

Publication number: CN111571283A
Application number: CN202010475724.7A
Authority: CN
Inventors: 王守仁; 于琪琪; 温道胜; 王高琦; 吴戍戌; 王坤坤; 禄心强; 肖滕; 郭宇
Original assignee: University of Jinan
Current assignee: University of Jinan
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2020-08-25

Abstract

The invention discloses a cylindrical gear clamp, which comprises: a base; the two arc-shaped jaws are hinged to the base, and the two arc-shaped jaws are symmetrical with respect to a given middle section on the base; the centers of the two arc-shaped jaws are opposite, and the back sides of the two arc-shaped jaws are provided with driving hinge points; the central angle of the arc-shaped jaw is more than or equal to 175 degrees and less than or equal to 180 degrees; the fluid cylinders correspond to the arc-shaped jaws one by one, the cylinder bodies of the fluid cylinders are hinged to the base, the push rods are hinged to the corresponding driving hinged points, and a triangular mechanism is formed between each push rod and the corresponding arc-shaped jaw and the corresponding base. The invention has less transmission links, thereby having better operation reliability.

Description

Cylindrical gear clamp

Technical Field

The invention relates to a cylindrical gear which is suitable for clamping gears during single-piece or small-batch trial production of gears.

Background

Compared with the transfer of production lines for producing gears in batches, when a single piece or a small batch of gears are produced in a test, the transfer of the single piece or the small batch of gears is usually completed by operating the clamp by workers because the gear transfer equipment is not arranged. Because the weight of the individual large gear is also large, manual carrying is very laborious, and the gear is inevitably collided, so that the subsequent manufacturing of the gear is influenced.

Chinese patent document CN207494733U discloses a gear processing gripping clamp, which includes a device body with a central circular hole, three symmetrical long openings are opened corresponding to the axial direction of the central circular hole, each long opening is equipped with a supporting block, a small bevel gear is installed on the supporting block through a screw, a large bevel gear is installed at the central circular hole, the large bevel gear and the small bevel gear are engaged, so that when the large bevel gear rotates, the three small bevel gears are synchronously driven. The bevel pinions form a nut of a nut screw mechanism, when the nut is in a position determining state, the screw inevitably moves axially, the screw is located in the long port, and the centripetal end of the screw is provided with the clamping plate. Relatively speaking, the harmomegathus motion that realizes by three bevel pinion, although the precision is higher, efficiency is on the low side, and when centre gripping gear, three bevel pinion place face down, and the device body shelters from the sight, influences the accurate clamp of getting of gear. In addition, the device essentially comprises seven motion mechanisms of two types, so that the transmission links are more, and the structure is relatively complex.

The inventor believes that the clamping structure of the gear is as simple as possible, and the transmission links are as few as possible, so that the number of fault points is reduced. And the transmission part adopts a mechanism with low precision and better reliability as much as possible so as to improve the smoothness of operation.

Disclosure of Invention

The invention aims to provide a cylindrical gear clamp which has fewer transmission links and better operation reliability.

In an embodiment of the present invention, there is provided a cylindrical gear jig including:

a base;

the two arc-shaped jaws are hinged to the base, and the two arc-shaped jaws are symmetrical with respect to a given middle section on the base; the centers of the two arc-shaped jaws are opposite, and the back sides of the two arc-shaped jaws are provided with driving hinge points; the central angle of the arc-shaped jaw is more than or equal to 175 degrees and less than or equal to 180 degrees;

the fluid cylinders correspond to the arc-shaped jaws one by one, the cylinder bodies of the fluid cylinders are hinged to the base, the push rods are hinged to the corresponding driving hinged points, and a triangular mechanism is formed between each push rod and the corresponding arc-shaped jaw and the corresponding base.

Optionally, the surface of the arc-shaped jaw, which is engaged with the clamped cylindrical gear, is a roller surface.

Optionally, the roller surface is formed by a plurality of roller shaft arrays arranged along the inner arc surface of the arc-shaped jaw in the circumferential direction.

Optionally, the arc-shaped jaw comprises two arc plates with the same geometric shape, and the two arc plates are assembled through an axial bolt, and the roll shaft is arranged between the two arc plates.

Optionally, each arcuate jaw is provided with five roller shafts;

the center distance between adjacent roll shafts is 2.2-3.0R;

and R is the roll surface radius of the roll shaft.

Optionally, the embedded handle of the arc-shaped jaw is provided with a U-shaped assembling port, and two ear plates of the U-shaped assembling port are provided with hinge shaft holes;

correspondingly, the base comprises a strip-shaped frame plate, and the U-shaped assembling opening straddles on the frame plate and is hinged with the frame plate through a hinge shaft.

Optionally, the frame plate provides a hinged support at both ends for articulation of the fluid cylinder.

Optionally, the base further comprises a seat plate perpendicular to the frame plate for assembly of the spur gear clamp on a given component.

Optionally, the triangular mechanism is provided with a locking device.

Optionally, the fluid cylinder is a hydraulic cylinder.

In an embodiment of the invention, the two triangular mechanisms share a frame, and the arc-shaped jaw can be used for clamping a cylindrical gear. When the cylindrical gear pliers are used, one or two triangular mechanisms act, the jaws are opened, the cylindrical gear is placed between the two arc-shaped jaws, then the triangular mechanisms act, the jaws are closed to clamp the cylindrical gear pliers, actuating links are few, and operation reliability is good. Meanwhile, the clamping opening surrounded by the two jaws is transparent in the radial direction, so that the operation of workers is facilitated.

Drawings

Fig. 1 is a schematic perspective view of a cylindrical gear clamp according to an embodiment.

FIG. 2 is a schematic front view of a cylindrical gear clamp according to an embodiment (with one of the arcuate jaws open).

FIG. 3 is a schematic top view of an embodiment of a cylindrical gear clamp.

FIG. 4 is a schematic front view of the cylindrical gear clamp according to an embodiment (with the jaws closed).

FIG. 5 is a left side view of the cylindrical gear clamp in an embodiment.

In the figure: 1. the clamp comprises a seat plate, 2 parts of an assembly hole, 3 parts of a frame plate, 4 parts of a hinge shaft, 5 parts of a clamp handle, 6 parts of a hydraulic cylinder, 7 parts of a rotating shaft, 8 parts of a push rod, 9 parts of a hinge shaft, 10 parts of a split pin, 11 parts of a connecting screw, 12 parts of a roller shaft, 13 parts of a rotating shaft, 14 parts of a support sheet and G parts of a cylindrical gear.

Detailed Description

The cylindrical gear clamp shown in fig. 1 is a clamp body, and does not include a component for dragging the clamp, that is, does not include a component for dragging the clamp connected to the seat plate 1 in fig. 1.

Referring to the drawings of the specification, figures 1 to 5, it can be seen that the clamp for clamping the spur gear G is generally similar to a clamp but driven by a fluid cylinder and belongs to the assembly formed by two co-mounted triangular mechanisms. The common part is the assembly formed by the seat plate 1 and the frame plate 3, i.e. the base, as shown in the figure, wherein the seat plate 1 and the frame plate 3 are preferably welded and connected.

The seat plate 1 is shown in the figure for connecting the above-described jig and the member for pulling the jig, and the seat plate 1 is shown to have a fitting hole 2, and the connection between the seat plate 1 and the member for pulling the jig can be performed by using, for example, a bolt.

The structure shown in fig. 2 and 4 roughly reflects two mechanisms for clamping the cylindrical gear G, namely two triangular mechanisms, the triangular mechanisms are formed by low pair connection in the figure, the driving component is a hydraulic cylinder 6 shown in the figure, and the extension and contraction of the hydraulic cylinder 6 generates the change of the length of one side of the triangle, thereby driving the other side, namely the jaw to open and close.

As can be clearly seen in fig. 2, the action surface of the jaw for providing the jaws is an arc-shaped surface, the jaw is an arc-shaped jaw, the number of the arc-shaped jaws is two, and the handles 5 of the two arc-shaped jaws are hinged to the base through the hinge shaft 4.

The two curved jaws are hinged to the base and are symmetrical with respect to the left and right middle section of the base, as can be seen in fig. 4, but do not indicate that the two curved jaws must be actuated simultaneously during use. As shown in fig. 2 in particular, in some embodiments, one of the two arcuate jaws is in a resting state and the other is driven by the triangular mechanism to which it belongs to effect clamping.

Accordingly, the centers of the two arc-shaped jaws are opposite to each other, and ideally, the centers of the two arc-shaped jaws are concentric in the state shown in fig. 4.

As can be seen in fig. 2 and 4, the back side of the curved jaws is provided with a driving articulation point to articulate with the push rod 8 of the fluid cylinder in an articulated manner.

In the structure shown in fig. 4, after the cylindrical gear G is clamped tightly by the two arc-shaped jaws, a gap is left at the upper end of the two arc-shaped jaws in the figure for avoiding interference, so that the cylindrical gear G can be clamped better.

For the foregoing purposes, the central angle of the single arcuate jaw should be less than 180 degrees, thereby allowing for a margin for reliable clamping.

In some embodiments, the total central angle of the two arcuate jaws is 360 degrees, which requires that the arcuate jaws have a good cylindrical fit with the cylindrical gear G.

In some embodiments, the inner surface of the arc-shaped jaw may contain an elastic material, such as a rubber lining, which has certain elasticity, so that the cylindrical gear G can be reliably clamped even if 180 degrees arc-shaped jaws are adopted.

The rubber lining can be attached to the inner surface of the arc-shaped jaw.

For better clamping reliability, the two curved jaws need to have a sufficiently large wrap angle, and therefore the central angle of each curved jaw is not too small, and in a preferred embodiment the central angle of the curved jaws is greater than or equal to 175 degrees and less than or equal to 180 degrees.

Regarding the fluid cylinder, the main ones commonly used in the industry are the air cylinder and the hydraulic cylinder 6, wherein the air cylinder has a fast response speed, even if leakage does not pollute the environment, but the noise is high, and the workpiece can be damaged by the fast speed. In contrast, the hydraulic cylinder 6 has a slow response speed but a high power density, and the individual size can be relatively small. And the noise is very small.

Correspondingly, the fluid cylinder and the arc-shaped jaw correspond to each other one by one, the cylinder body of each fluid cylinder is hinged to the base, and the side where the hinged point is located is the side where the corresponding arc-shaped jaw is located. The push rod 8 of the fluid cylinder is hinged with a corresponding driving hinge point, namely a hinge point at the back side of the corresponding arc-shaped jaw, so that a triangular mechanism is formed between the push rod and the base and between the push rod and the corresponding arc-shaped jaw.

The triangular mechanism belongs to the simplest mechanism in the mechanical field and essentially belongs to a four-bar mechanism, wherein a fluid cylinder equivalently provides two components, a hinge corresponding to a planar mechanism is connected by a cylindrical hinge, one end of a hinge shaft 4 is provided with a head, the other end of the hinge shaft is provided with a radial hole, after the hinge shaft 4 is inserted into a related hinge shaft hole, the head end directly forms restraint, and the other end is limited by a cotter pin 10 shown in figure 1.

As mentioned above, when the clamp is used, a single triangular mechanism can move, and two triangular mechanisms can also move simultaneously, so that the clamp is good in use flexibility.

As can be seen from the figure 2, the arc-shaped jaw is not blocked in the axial direction, the position of the cylindrical gear G can be directly observed, and the operation accuracy is relatively good.

Since the spur gear G may be a blank that is not sized to a final state, in some embodiments, the inner surface of the arcuate jaws may have a rubber lining, for example, with some dimensional tolerance, as previously described.

In some embodiments, because the cylindrical gear G has a tooth slot, the surface of the arc-shaped jaw that engages the clamped cylindrical gear G is a roll surface, which also has an inter-roll gap, and the dimensional tolerance of the gear can be well adapted by the self-rotation of the roll shaft 12.

The roller 12 itself can also be fitted with a rubber sleeve, for example, to adapt to the size of the spur gear G.

Correspondingly, the roll surface is formed by a plurality of roll shaft 12 arrays which are distributed along the circumferential direction of the inner arc surface of the arc-shaped jaw, and the arrays comprise uniform arrays and nonuniform arrays. If the uniform array is adopted, the number of the roll shafts 12 is not suitable to be too much, otherwise the cylindrical gear G cannot be clamped well, when the roll shafts 12 are more, the gaps among the roll shafts 12 can just accommodate gear teeth, or sufficient space can accommodate the gear teeth, and the cylindrical gear G cannot be clamped effectively. For the roller shafts 12 in the uneven array, because the gear teeth on the cylindrical gear G are uniformly distributed, when some gear teeth fall into the gaps between the roller shafts 12, some gear teeth inevitably make mechanical contact with the roller shafts 12, so that the clamping effect can be achieved.

When the rollers 12 are arranged unevenly, the number of the rollers 12 can be relatively large.

When an even arrangement of rollers 12 is used, in the preferred embodiment, the number of rollers 12 is five, i.e., five rollers 12 are provided per arcuate nip.

Furthermore, when the number of the roll shafts 12 is small, the diameters of the roll shafts 12 are relatively large, and the center distance between every two adjacent roll shafts 12 is 2.2-3.0R; and R is the roll surface radius of the roll shaft.

In the configuration shown in fig. 1 and 3 and 5, the arc-shaped jaws comprise two arc plates of identical geometry, i.e. the support plates 14 shown in fig. 1.

In a preferred embodiment, as shown in fig. 3, one of the support plates 14 is relatively thick for providing the driving hinge point, i.e. the push rod 8 of the hydraulic cylinder 6 in fig. 1 is hinged to the support plate 14 with the larger thickness.

The other support plate 14 takes a thicker support plate 14 as a mounting base and is assembled through bolts. In fig. 1, the bolt is shown as the attachment screw 11 in fig. 1.

Further, the roller 12 is interposed between the two support sheets 14, and the distance between the two support sheets 14 may be determined by the roller 12. The roll shaft 12 has shoulders at both ends for positioning the two support pieces 14, and the length of the portion of the roll shaft 12 between the shoulders is the distance between the two support pieces 14. After the two support pieces 14 are positioned based on the roller shaft 12, fastening is performed using the connection screw 11 shown in fig. 1.

The handle 5 of the arc-shaped jaw is also arranged on the thicker supporting sheet 14 or is integrated with the thicker supporting sheet 14. In fig. 1, the forceps handle 5 has a U-shaped mounting opening, and two ear plates of the U-shaped mounting opening are provided with hinge shaft holes.

Correspondingly, the base comprises a strip-shaped frame plate 3, and the U-shaped assembling opening straddles the frame plate 3 and is hinged with the frame plate 3 through a hinge shaft 4.

Further, both ends of the frame plate 3 provide hinge supports for the articulation of the fluid cylinders.

Furthermore, the base comprises a seat plate 1 perpendicular to the frame plate 3 for the assembly of the spur gear clamp on a given part.

In fig. 1, the seat plate 1 is a circular plate, and it is understood that the mounting holes 2 arranged along the circumferential direction of the end face of the seat plate 1 in fig. 1 may be arranged in a direction parallel to the frame plate 3, and therefore, the seat plate 1 may be a rectangular plate, for example.

In the previously described embodiments it is pointed out that the two triangular mechanisms can be actuated by only one, so that in a preferred embodiment the triangular mechanisms are provided with locking means. With regard to the locking of the mechanism, if there is only one degree of freedom of the mechanism, the mechanism can be locked by locking any one of its movable members. In the preferred embodiment, taking the locking push rod 8 as an example, a set screw hole is formed at the guide sleeve at the head end of the cylinder of the hydraulic cylinder 6 in the figure, and the hydraulic cylinder 6 can be locked by using the set screw, so that the corresponding triangular mechanism becomes a statically stable structure.

Claims

1. A cylindrical gear clamp, comprising:

a base;

2. The cylindrical gear clamp of claim 1 wherein the surface of the arcuate jaws that engages the clamped cylindrical gear is a roll surface.

3. The cylindrical gear clamp of claim 2 wherein the roller surface is formed by an array of a plurality of rollers circumferentially disposed along the intrados of the arcuate jaws.

4. The cylindrical gear clamp of claim 3 wherein the arcuate jaw comprises two arcuate plates of identical geometry assembled by axial bolts, the roller shaft being interposed between the arcuate plates.

5. A cylindrical gear clamp according to claim 3 or 4 wherein there are five rollers on each arcuate jaw;

the center distance between adjacent roll shafts is 2.2-3.0R;

and R is the roll surface radius of the roll shaft.

6. The cylindrical gear clamp as claimed in claim 1, wherein the embedded handle of the arc-shaped jaw is provided with a U-shaped assembly port, and two ear plates of the U-shaped assembly port are provided with hinge shaft holes;

7. A cylindrical gear clamp according to claim 6 wherein the frame plate provides hinged abutments at both ends for articulation of the fluid cylinder.

8. The spur gear clamp as claimed in claim 6 or 7 wherein the base further comprises a seat plate perpendicular to the frame plate for assembly of the spur gear clamp on a given component.

9. A cylindrical gear clamp according to claim 1 wherein the triangular mechanism is provided with locking means.

10. The cylindrical gear clamp of claim 1 wherein the fluid cylinder is a hydraulic cylinder.