CN209868022U - Two-way centering fixture of cross bevel gear transmission, worm gear self-locking - Google Patents

Abstract

The utility model relates to a cross-bevel gear transmission and worm gear self-locking bidirectional centering fixture, which belongs to the field of mechanical manufacturing. The two-way self-centering clamping mechanism is fixed on the base through the first bearing support component and the second bearing support component, and the locking mechanism is fixedly connected with the four sides of the base, and locks the two-way self-centering clamping mechanism. The advantage is that the structure is novel, not only can clamp ordinary cylindrical workpieces, but also can realize accurate self-centering clamping of common workpieces with square cross-sections, high precision, simple operation, good versatility, fast adjustment speed, which can not only reduce the labor intensity of workers, The processing efficiency is improved, and the manufacturing cost of the fixture can be saved.

Description

A self-locking two-way centering fixture with cross bevel gear transmission and worm gear

technical field

The utility model belongs to the field of mechanical manufacturing, in particular to a self-locking bidirectional centering fixture.

Background technique

With the further development of the manufacturing industry, various fixtures emerge in an endless stream. It is more common to clamp workpieces with circular cross-sections, but it is difficult to center and clamp workpieces with square cross-sections, and the fixed-axis rotation of workpieces is even more difficult to solve. In the manufacture or repair of machine tools, it is often encountered workpieces that cross holes on the cylinder. The center lines of the holes or threaded holes of these workpieces do not intersect. They need to be assembled after the cylinder is turned, and the position line of the hole is drawn, and then processed according to the line. holes or threads. In the past, after the line was drawn on the workpiece, the four-jaw chuck was used to install it according to the line, and then the inner hole was processed. During the correction process, when the two claws clamped on the cylindrical surface are adjusted, the workpiece will roll, causing the center line of the marking hole to have an angular displacement. It is difficult to correct the workpiece and produce processing waste, because the positioning accuracy of the workpiece during processing is relatively high Low, resulting in low pass rate of production workpieces.

Contents of the invention

The utility model provides a cross-bevel gear transmission, worm gear self-locking two-way centering fixture, the purpose is not only to clamp ordinary cylindrical workpieces, but also to realize accurate self-centering clamping of common workpieces with square cross-sections.

The technical scheme adopted by the utility model: includes a two-way self-centering clamping mechanism, a locking mechanism, a base, a bearing support component 1 and a bearing support component 2, wherein the two-way self-centering clamping mechanism passes through the bearing support component 1 and the bearing support component The second is fixed on the base, the locking mechanism is fixedly connected with the four sides of the base, and the two-way self-centering clamping mechanism is locked.

The two-way self-centering clamping mechanism described in the utility model comprises bevel gear front box body, bevel gear rear box body, bevel gear, guide rail, guide rail support, bevel gear stud 1, slider, split nut, clamping block , Rotary handle 1, lock nut 1, locking stud connection hole, bevel gear stud 2, among which four sets of bevel gears are cross meshed and fixed in the bevel gear box through rolling bearings, the bevel gear box is divided into bevel gear front box and the rear box of the bevel gear, the two are closely connected by bolts, and the opposite direction is opposite to the direction of rotation of the bevel gear. It is linearly slidably connected with the guide rail, the clamping block is fixed on the half nut through the hexagon socket bolt and the positioning pin, the guide rail bracket is fixed on the base, one set of opposite bevel gear studs is fixed on the base through the bearing support assembly, and the other set The bevel gear stud 2 is fixed on the base through the bearing support assembly, the extension end of the bevel gear stud 1 is connected to the rotary handle 1, the lock nut 1 locks the bearing support assembly and the bevel gear stud 1, and the locking stud connection hole is used For connection with locking studs;

The locking mechanism described in the utility model includes a worm gear transmission assembly, a bearing end cover 1, a locking nut 2, a locking stud, a locking pressure plate, and a pressure plate pressing block, and the worm gear box is fixed by bolts and positioning pins. On the side plate of the base, the threaded end of the worm gear rod is connected with the locking pressure plate through a threaded hole, the thread of the threaded hole of the locking pressure plate is opposite to the thread direction of the worm gear rod, and the lock nut 2 locks the worm gear rod and is threadedly connected with the locking pressure plate , the pressure plate block fixes the locking pressure plate on the base through bolts, the locking stud is connected to the locking stud connection hole of the split nut, and is located between the locking pressure plate and the base, the bearing end cover is sealed with the worm gear rod connection to the base.

The worm gear transmission assembly described in the utility model comprises a worm wheel, a worm gear rod, a worm, a worm gear box, a rotating handle 2, a bearing end cover 2, a bolt hole, a positioning pin hole, a key, a snap spring, and a rolling bearing, wherein the worm gear and The worm is fitly installed in the worm gear box. The worm is supported in the worm gear box by rolling bearings. The worm gear rod is connected with the worm gear through keys and retaining springs. Two seal the connection between the worm and the worm gear casing, the second rotating handle is connected with the worm, and the worm gear and worm casing is connected to the base through the bolt holes and the positioning pin holes with bolts and positioning pins.

The lower surface of the locking platen in the utility model adopts a wave-shaped microstructure, and the locking bolt adopts a convex-groove microstructure.

The expansion helix angle of the worm described in the utility model is smaller than the friction angle of the worm wheel contact, that is, β<Φ, β is the expansion helix angle of the worm, and Φ is the friction angle.

The utility model has the advantages of novel structure, including two-way self-centering tightening mechanism and locking mechanism, reasonable use of cross bevel gear meshing transmission, a group of bevel gears as the rotating shaft, and a corresponding meshing group of bevel gears as the driven shaft, and the rotating shaft rotates It drives the driven shaft to rotate synchronously, thereby controlling the relative movement of the split nut on the bevel gear stud, realizing fast clamping and synchronous centering movement with high centering accuracy. Reasonable use of worm gear and worm transmission, the worm is used as the rotating shaft, and the rotation of the worm drives the rotation of the worm wheel, so as to realize the locking movement of the locking platen and the locking of the self-centering tightening mechanism; the threaded hole and the The pin hole can be connected with clamping blocks of different shapes according to actual requirements, which greatly enhances the versatility of the fixture.

The utility model can not only clamp ordinary cylindrical workpieces, but also realize accurate self-centering clamping of common workpieces with square cross-sections, high precision, simple operation, good versatility, and fast adjustment speed, which can not only reduce the labor intensity of workers, but also improve processing Efficiency, and can save the manufacturing cost of the fixture.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a structural schematic diagram of the clamping mechanism of the present invention;

Fig. 3 is the structural representation of locking mechanism of the present utility model;

Fig. 4 is the assembly diagram of the utility model worm gear;

Fig. 5 is a schematic diagram of the relative position of the worm gear rod and the worm gear box of the utility model;

Fig. 6 is a schematic diagram of the relative positions of the worm and the worm box of the utility model;

Fig. 7 is a partially enlarged schematic diagram of the surface structure of the locking platen and the locking stud of the present invention;

Fig. 8 is a schematic diagram of the rotation direction of the utility model bevel gear;

Fig. 9 is a schematic diagram of the relative positions of the locking press plate and the press block of the utility model;

Fig. 10 is a schematic diagram of the replaceable clamping block of the present invention.

Detailed ways

As shown in Figure 1, it includes a two-way self-centering clamping mechanism 1, a locking mechanism 2, a base 3, a bearing support assembly 1 4 and a bearing support assembly 2 5, wherein the two-way self-centering clamping mechanism 1 passes through the bearing support assembly 1 4 and the bearing support assembly 2 5 are fixed on the base 3, the locking mechanism 2 is fixedly connected with the four sides of the base 3, and the two-way self-centering clamping mechanism 1 is locked; the two-way synchronization is realized by rationally utilizing the different transmission directions of the cross bevel gear meshing Self-centering clamping, high centering accuracy;

As shown in Fig. 2, described two-way self-centering clamping mechanism 1 comprises bevel gear front box body 101, bevel gear rear box body 102, bevel gear 103, guide rail 104, guide rail support 105, bevel gear stud one 106, Slide block 107, split nut 108, clamping block 109, rotary handle one 110, lock nut one 111, locking stud connection hole 112, bevel gear stud two 113, wherein four groups of bevel gears 103 are intermeshed, pass The rolling bearing is fixed in the bevel gear box, which is divided into a bevel gear front box 101 and a bevel gear rear box 102, the two are tightly connected by bolts, and the bevel gear box constrains the relative positional relationship between the bevel gears 103, relative The direction of rotation of the bevel gear is opposite, and the bevel gear studs one 106 are threadedly connected with half nuts 108 respectively, and the half nuts 108 are fixed on the slide block 107 of the guide rail 104, and the slide block 107 is linearly slidably connected with the guide rail 104, clamped Block 109 is fixed on the half nut 108 by hexagon socket bolts and positioning pins, guide rail bracket 105 is fixed on the base 3, one set of relative bevel gear studs 106 is fixed on the base 3 through the bearing support assembly 4, and the other set of relative The second bevel gear stud 113 is fixed on the base 3 through the bearing support assembly 5, the extended end of the bevel gear stud one 106 is connected to the rotary handle one 110, and the lock nut one 111 locks the bearing support assembly and the bevel gear stud one 106, the locking stud connection hole 112 is used to connect with the locking stud;

As shown in Figures 3 and 9, the locking mechanism 2 includes a worm gear drive assembly 201, a bearing end cover 1 202, a locking nut 2 203, a locking stud 204, a locking pressing plate 205, and a pressing plate pressing block 206 , the worm gear box 2014 is fixed on the side plate of the base 3 through bolts and positioning pins, the threaded end of the worm gear rod 2012 is connected with the locking pressure plate 205 through the threaded hole, and the threaded hole thread of the locking pressure plate 205 is in the direction of the thread of the worm gear rod 2012 On the contrary, the locking nut 2 203 locks the worm gear rod and is threadedly connected with the locking pressing plate 205, and the locking pressing plate 205 is fixed on the base 3 by the pressing plate pressing block 206, and the locking stud 204 is connected to the half nut 108. In the locking stud connection hole 112 and between the locking platen 205 and the base 3 , the bearing end cover 1 202 seals the connection between the worm gear rod 2012 and the base 3 .

As shown in Figures 4, 5, and 6, the worm gear assembly 201 includes a worm gear 20101, a worm gear rod 20102, a worm screw 20103, a worm gear housing 20104, a rotary handle 20105, a bearing end cover 20106, and a bolt hole 20107 , positioning pin hole 20108, key 20109, circlip 20110, rolling bearing 20111, wherein the worm gear 20101 and the worm 20103 are fitted in the worm gear box 20104, and the worm gear box limits the relative position of the worm wheel 20101 and the worm screw 20103, and the worm screw 20103 passes through the rolling bearing 20111 is supported in the worm gear box 20104, the worm gear rod 20102 is connected with the worm gear 20101 through the key 20109 and the circlip 20110, the end of the worm gear rod 20102 close to the worm gear 20101 is fixed in the worm gear and worm housing through the rolling bearing 20111 and the circlip 20110, the bearing end cover two 20106 seals the connection between the worm 20103 and the worm casing 20104, the second rotating handle 20105 is connected with the worm 20103, and the worm casing 20104 is connected to the base 3 through the bolt hole 20107 and the location pin hole 2018 with bolts and positioning pins.

As shown in FIG. 7 , in order to better lock the locking bolt 204 in the present invention, the lower surface of the locking pressure plate 205 adopts a wave-shaped microstructure, and the locking bolt 204 adopts a convex-groove microstructure.

In order to realize the self-locking of the worm gear 201 in the utility model, the expansion helix angle of the worm is smaller than the friction angle of the worm gear contact, that is, β<Φ, where β is the expansion helix angle of the worm, and Φ is the friction angle.

working principle:

Firstly, put the fixture in the initial loose position, and replace the appropriate clamping block according to the shape of the workpiece to be processed. 110, make the two-way self-centering clamping mechanism carry out centering clamping on the workpiece, when the workpiece is in the clamped state, stop rotating the rotating handle 110, tighten the lock nut 111, so that the bevel gear structure cannot be reversed, and then adjust the lock Tightening mechanism 2, that is, turn the rotating handle 20105, and the rotating handle 20105 drives the worm gear structure to rotate. After the locking mechanism locks the fixture, stop rotating the rotating handle 20105. Since the worm gear adopts a self-locking structure, the locking mechanism 2 automatically Lock, tighten the lock nut 2 203 to lock the lock platen 205 so that the lock plate 205 and the worm gear rod 2012 cannot rotate in reverse. The worm, after releasing the clamping mechanism locking nut one 111, reversely rotates the handle one 110 to make the clamp return to the initial loose position, and finally the workpiece is taken out.

Below in conjunction with accompanying drawing, the utility model will be further described.

As shown in Figure 2, in the two-way self-centering clamping mechanism 1, the rotary handle 110 is fixedly connected with the bevel gear stud 106, which drives the bevel gear stud 106 to rotate on a fixed axis, and the three meshed bevel gears 103 follow Rotate, and drive its corresponding bevel gear studs to rotate, the relative bevel gears rotate in the opposite direction, as shown in Figure 8, the bevel gear box constrains the relative position between the meshing bevel gears, The rotation drives the half nut installed on the bevel gear stud to move relatively along the track 104 to realize two-way centering movement; when the half nut 108 drives the clamping block 109 mounted on its upper side to clamp the workpiece, the rotation stops Handle one 110, tighten lock nut one 111, make bevel gear can not reverse rotation.

As shown in Figures 3 and 4, the worm gear transmission assembly 201 is installed on the base 3 through bolts and positioning pins, and the rotating handle 20105 connected to the worm 20103 is rotated, and the worm gear 20101 rotates accordingly, and the worm gear 20101 drives the worm gear rod 20102 to rotate. The end of the worm gear rod 20102 away from the worm gear 20101 is threadedly connected with the locking pressure plate and the thread direction is opposite. The rotation of the worm gear rod 20102 makes the locking pressure plate 205 move downward, and the locking nut 203 is tightened to limit the reverse movement of the locking pressure plate 205. The unfolding helix angle is smaller than the friction angle of the worm gear and worm, so that the worm gear 201 is self-locking and cannot be reversed.

The relative position of the worm gear and worm in the worm gear and worm housing is shown in Figure 5 and Figure 6. The worm 20103 is fixed in the worm gear and worm housing 20104 by the rolling bearing 20111, and the worm gear 20101 is connected with the worm gear 20102 by the snap spring 20110 and the key 20109. The combination is fixed in the worm gear casing 20104 by a snap spring 20110 and a rolling bearing.

As shown in FIG. 7 , the surface microstructures of the locking platen 205 and the locking stud 204 can better limit the backward movement of the locking stud through microstructure treatment.

As shown in FIG. 9 , the relative positional relationship between the pressing plate pressing block 206 and the locking pressing plate 205 installed on the base 3 .

Claims (6)

1. The utility model provides a two-way centering anchor clamps of cross bevel gear transmission, worm and gear self-locking which characterized in that: the bidirectional self-centering clamping mechanism is fixed on the base through the bearing supporting component I and the bearing supporting component II, and the locking mechanism is fixedly connected with four sides of the base and locks the bidirectional self-centering clamping mechanism.

2. The cross bevel gear transmission and worm and gear self-locking bidirectional centering clamp of claim 1, wherein: the bidirectional self-centering clamping mechanism comprises a bevel gear front box body, a bevel gear rear box body, a bevel gear, a guide rail bracket, a bevel gear stud I, a slide block, a split nut, a clamping block, a rotating handle I, a locking nut I, a locking stud connecting hole and a bevel gear stud II, wherein four groups of bevel gears are meshed in a crossed manner and are fixed in the bevel gear box body through a rolling bearing, the bevel gear box body is divided into a bevel gear front box and a bevel gear rear box body which are tightly connected through bolts, the bevel gear rotating directions in opposite directions are opposite, the bevel gear stud I is respectively in threaded connection with the split nut, the split nut is fixed on the slide block of the guide rail, the slide block is in linear sliding connection with the guide rail, the clamping block is fixed on the split nut through an inner hexagon bolt and a positioning pin, the guide rail, the other set of opposite bevel gear stud two-way is fixed on the base through a bearing support assembly, the extending end of the bevel gear stud one is connected with a rotating handle one, a locking nut locks the bearing support assembly and the bevel gear stud one, and a locking stud connecting hole is used for being connected with a locking stud.

3. The cross bevel gear transmission and worm and gear self-locking bidirectional centering clamp of claim 1, wherein: the locking mechanism comprises a worm and gear transmission assembly, a bearing end cover I, a locking nut II, a locking stud, a locking pressing plate and a pressing plate pressing block, a worm and gear box body is fixed on a base side plate through a bolt and a positioning pin, one end of the worm with threads is connected with the locking pressing plate through a threaded hole, the direction of the threaded hole of the locking pressing plate is opposite to that of the thread of the worm, the worm and gear is locked by the locking nut II and is in threaded connection with the locking pressing plate, the pressing plate pressing block fixes the locking pressing plate on the base through the bolt, the locking stud is connected into a locking stud connecting hole of the split nut and is positioned between the locking pressing plate and the base, and the joint of the worm and the base.

4. The cross bevel gear transmission, worm gear self-locking bidirectional centering clamp of claim 3, wherein: the worm and gear transmission assembly comprises a worm wheel, a worm wheel rod, a worm and gear box body, a rotating handle II, a bearing end cover II, bolt holes, positioning pin holes, keys, clamp springs and rolling bearings, wherein the worm wheel and the worm are installed in the worm and gear box body in a matched mode, the worm is supported in the worm and gear box body through the rolling bearings, the worm wheel rod is connected with the worm wheel through the keys and the clamp springs, the worm wheel rod is close to the worm wheel end and fixed in the worm and gear box body through the rolling bearings and the clamp springs, the bearing end cover II seals the joint of the worm and gear box body, the rotating handle II is connected with the worm, and the worm and gear box body is connected to.

5. The cross bevel gear transmission, worm gear self-locking bidirectional centering clamp of claim 4, wherein: the unfolding spiral angle of the worm is smaller than the friction angle of the contact of the worm gear and the worm, namely beta is less than phi, beta is the unfolding spiral angle of the worm, and phi is the friction angle.

6. The cross bevel gear transmission, worm gear self-locking bidirectional centering clamp of claim 3, wherein: the lower surface of the locking pressure plate adopts a wave-shaped microstructure, and the locking bolt adopts a convex groove type microstructure.