CN215171648U - Novel telescopic drum-shaped tooth type coupling - Google Patents

Abstract

The utility model discloses a novel telescopic drum-shaped tooth type coupling, which comprises a roller end component, a shaft component and a tooth end component, wherein the roller end component comprises an external tooth shaft sleeve, an inner gear ring, a pressure ring and a blank cap; the external tooth shaft sleeve is connected with the inner gear ring through the gear pair, and the external tooth shaft sleeve, the pressing ring and the blank cap are connected through a thread structure I. The utility model discloses the axle subassembly of shaft coupling includes connecting axle, holder, two journal stirrup in front and back, is provided with the bearing between holder and the connecting axle, is connected through connection structure II between journal stirrup and the holder. The utility model discloses be provided with connection structure III between ring gear and the connecting axle of shaft coupling. The coupler has the advantages of simple structure, small processing difficulty, capability of effectively saving the manufacturing cost, easiness in maintenance and replacement and capability of meeting the requirements of a rod and wire production line. Meanwhile, the production efficiency of the rod and wire production line is improved, and the production cost and the maintenance cost of the rod and wire production line are reduced.

Description

Novel telescopic drum-shaped tooth type coupling

Technical Field

The utility model belongs to the technical field of the transmission, especially, relate to a drum-shaped tooth-like shaft coupling that is used for connecting between the transmission equipment on excellent wire rod production line.

Background

The coupling is a very common part in mechanical structures, and is a mechanical part used for coupling two shafts (a driving shaft and a driven shaft) in different mechanisms to rotate together so as to transmit torque. In recent years, with the increasingly severe situation of steel mills, cost reduction and efficiency improvement become development trends of various steel mills, and efficient, continuous and high-precision rolling equipment is required for various rod and wire production lines, so that a new challenge is also created for related spare part industries. In order to meet the requirements of high-precision and high-quality rod and wire materials produced on site, the transmission equipment needs to be adjusted and improved in time according to actual requirements. As the drum-shaped gear coupling is a key transmission component of the whole set of rolling equipment, the performance quality of the drum-shaped gear coupling is closely related to the yield and quality of rod and wire products, and the technical requirements are higher and higher.

The disadvantages of the current drum tooth couplings, as shown in fig. 24 and 25, are: the roller end component comprises an external gear shaft sleeve, an internal gear ring and a blank cap, the blank cap is of an integral structure, the left end of the blank cap is directly pressed on the external gear shaft sleeve and is connected through a bolt, the utilization rate of an integral blank cap material is low, the radian on the blank cap material is large in manufacturing difficulty, and the manufacturing and replacing cost is high; the shaft assembly comprises a connecting shaft and a retainer, two shaft lugs on the retainer and the retainer are of an integral structure, the material utilization rate is low, the manufacturing cost is high, and the shaft lugs of the retainer are directly connected with rolling mill equipment, so that the risk of breakage of the shaft lugs on two sides of the retainer can be increased when the runout of the coupler is increased, the continuous operation is particularly remarkable, when the shaft lugs of the retainer are broken, the retainer can be detached from the coupler only by sequentially detaching a right gland and a locking nut, the maintenance time and cost are greatly increased, and great loss is brought to a bar and wire material factory; thirdly, the inner gear ring and the connecting shaft are connected through a single key, the key is easy to crush and needs to be replaced, maintenance and adjustment are complicated, maintenance cost and difficulty are increased, and working efficiency is affected.

Disclosure of Invention

The utility model aims to solve the problem that a novel concertina type cydariform tooth-like shaft coupling is provided, this shaft coupling simple structure, the processing degree of difficulty are little, can effectually practice thrift manufacturing cost, and easy maintenance and change have satisfied the demand of excellent wire rod production line. Meanwhile, the production efficiency of the rod and wire production line is improved, and the production cost and the maintenance cost of the rod and wire production line are reduced.

The utility model relates to a novel telescopic drum-shaped tooth type coupling, which comprises a roller end component, a shaft component and a tooth end component, wherein the roller end component comprises an external tooth shaft sleeve, an inner gear ring, a pressure ring and a blank cap; the external tooth shaft sleeve is connected with the inner gear ring through the gear pair, and the external tooth shaft sleeve, the pressing ring and the blank cap are connected through a thread structure I.

Further, the thread structure I is in a long bolt connection mode: the device comprises a screw hole I on an external gear shaft sleeve, a screw hole II on a pressure ring and a screw hole III on a blank cap; the long bolt penetrates through the screw hole III and the screw hole II and then is screwed with the screw hole I.

Further, the thread structure I is in a double-thread pair connection mode: the hot stamping die comprises an external thread II at the right end of an external tooth shaft sleeve, an internal thread II at the left end of a compression ring, an external thread I at the right end and an internal thread I at the left end of a blank cap; external screw thread II is connected through the screw thread pair with internal thread II, and external screw thread I is connected through the screw thread pair with internal thread I.

Further, the thread structure I is in a bolt and thread pair connection mode: the device comprises a screw hole I on an external tooth shaft sleeve, a screw hole IV and a counter bore on a pressure ring, an external thread I at the right end of the pressure ring and an internal thread I at the left end of a blank cap; the bolt penetrates through the counter bore and the screw hole IV and then is screwed with the screw hole I, and the external thread I is connected with the internal thread I through a thread pair; the device comprises an external thread II at the right end of an external tooth shaft sleeve 1, an internal thread II and a screw hole V at the left end of a pressure ring and a screw hole III on a blank cap; the external thread II is connected with the internal thread II through a thread pair, and the bolt penetrates through the screw hole III and then is screwed with the screw hole V.

Further, the thread structure I also comprises an end face connection: the end face connection comprises a plurality of key grooves on the right end face of the pressure ring, a plurality of key grooves on the left end face of the blank cap and a plurality of end face keys, the number of the key grooves is equal to that of the key grooves, the key grooves are uniformly distributed, and the end face keys are clamped in the two key grooves and are tightly pressed on the pressure ring through screws; the end face connection comprises end face teeth on the right end face of the pressing ring and end face teeth on the left end face of the blank cap, and the two end face teeth are meshed with each other.

Further, the shaft assembly comprises a connecting shaft, a retainer and a front shaft lug and a rear shaft lug, a bearing is arranged between the retainer and the connecting shaft, and the shaft lugs are connected with the retainer through a connecting structure II.

Further, the connection structure II is in a threaded connection mode: the device comprises threaded holes on the front end face and the rear end face of a retainer and threaded heads on shaft lugs; the threaded head is screwed with the threaded hole, and the step surface of the shaft lug is tightly pressed on the end surface of the threaded hole.

Further, connection structure II is the welding connection mode: the device comprises cylindrical holes on the front end surface and the rear end surface of a retainer and cylindrical heads on shaft lugs; the cylindrical head is inserted into the cylindrical hole, the step surface of the shaft lug is tightly pressed on the end surface of the cylindrical hole, and the joint of the end surfaces is welded.

Furthermore, the connecting structure II is in a bolt type connecting mode; the connecting structure II comprises a rectangle on the front end surface and the rear end surface of the retainer and a rectangle head on the shaft lug; the rectangular head is inserted into the rectangular hole, and the step surface of the shaft lug is tightly pressed on the end surface of the rectangular hole; the connecting structure II comprises flat holes on the front end face and the rear end face of the retainer and flat heads on the shaft lugs; the flat head is inserted into the flat hole, and the step surface of the shaft lug is tightly pressed on the end surface of the flat hole.

Further, a connecting structure III is arranged between the inner gear ring and the connecting shaft.

Further, the connecting structure III is a rectangular gear pair connecting mode: the inner gear ring comprises rectangular inner teeth on an inner hole of the inner gear ring and rectangular outer teeth on the outer circle of a connecting shaft; the rectangular inner teeth are meshed with the rectangular outer teeth.

Further, connection structure III is the vice connected mode of involute spline: the connecting shaft comprises an involute inner spline on an inner hole of an inner gear ring and an involute outer spline on an excircle of a connecting shaft; the involute internal spline is matched with the involute external spline.

Further, the connection structure iii is a male-female connection mode: the inner gear ring comprises a plurality of bulges on an inner hole of the inner gear ring and a plurality of grooves on the excircle of the connecting shaft; the bulge is embedded in the groove; the bulges and the grooves are equal in quantity and are uniformly distributed.

Further, the connecting structure III is a bond connection: the inner ring gear comprises a plurality of grooves on an inner hole of the inner ring gear, a plurality of grooves on the excircle of a connecting shaft, a plurality of keys, a key connecting groove and a groove; when the key is a B-type key, the number of the grooves, the grooves and the keys is two and is distributed at 120 degrees; when the key is a B1 type key, the number of the grooves, the grooves and the keys is two and is distributed at 180 degrees; when the key is a D-shaped key, the number of the grooves, the grooves and the keys is two, and the grooves, the grooves and the keys are distributed at 120 degrees or 180 degrees.

The utility model discloses the advantage of shaft coupling is: firstly, the existing integral blank cap is split into a press ring and a blank cap split structure in the roller end assembly, so that the blank cap has no radian any more, and therefore, the material utilization rate is high, the manufacturing difficulty is low, and the cost is low; secondly, the existing integral retainer is split into the retainer and two lug split structures in the shaft assembly, so that the material utilization rate is high, the manufacturing cost is low, and when the lugs are broken, only the lugs need to be replaced without detaching a right gland and a locking nut to replace the retainer, the maintenance is convenient, and the maintenance time and the maintenance cost are greatly reduced; thirdly, the connection between the inner gear ring and the connecting shaft is reliable through the connecting structure III, keys do not need to be frequently replaced, the maintenance cost and the maintenance difficulty are reduced, and the working efficiency is improved.

In a word, the telescopic drum-shaped tooth type coupler of the utility model has the advantages that the structure is simple, the processing difficulty is small, the material utilization rate is high, and the manufacturing cost is reduced through the different connection modes of the external tooth shaft sleeve, the compression ring and the blank cap, the different connection modes of the retainer and the shaft lug and the different connection modes of the inner gear ring and the connecting shaft; meanwhile, the parts are not easy to damage, the parts are convenient to maintain after being damaged, the maintenance time is shortened, the production cost and the maintenance cost of the rod and wire production line are reduced, the production efficiency of the rod and wire production line is improved, and the requirements of the rod and wire production line are met.

Drawings

Fig. 1 is a schematic view of the assembly structure of the coupling of the present invention;

fig. 2 is a schematic view of the assembly structure of the coupling of the present invention;

fig. 3 is a third schematic view of the assembly structure of the coupling of the present invention;

fig. 4 is a schematic view of the assembly structure of the coupling of the present invention;

fig. 5 is a schematic diagram of the general assembly structure of the coupling of the present invention;

FIG. 6 is a cross-sectional view taken along line E-E of FIG. 5;

fig. 7 is a schematic diagram six of the general assembly structure of the coupling of the present invention;

FIG. 8 is a cross-sectional view taken along line F-F of FIG. 7;

fig. 9 is a first schematic view of the connection between the retainer and the shaft lug of the coupling of the present invention;

FIG. 10 is a cross-sectional view taken along line C-C of FIG. 9;

fig. 11 is a second schematic view of the connection between the retainer and the shaft lug of the coupling of the present invention;

FIG. 12 is a cross-sectional view taken along line A-A of FIG. 11;

fig. 13 is a third schematic view of the connection between the retainer and the shaft lug of the coupling of the present invention;

FIG. 14 is a cross-sectional view taken along line B-B of FIG. 13;

fig. 15 is a fourth schematic view of the connection between the retainer and the shaft lug of the coupling of the present invention;

FIG. 16 is a cross-sectional view taken along line D-D of FIG. 15;

FIG. 17 is a sectional view taken along line G-G of FIG. 1;

FIG. 18 is a sectional view taken along line H-H in FIG. 2;

FIG. 19 is a cross-sectional view taken along line J-J of FIG. 3;

FIG. 20 is a cross-sectional view taken along line K-K of FIG. 4;

FIG. 21 is a sectional view taken along line L-L of FIG. 5;

FIG. 22 is a cross-sectional view taken along line M-M of FIG. 7;

FIG. 23 is a schematic cross-sectional view of a D-shaped key;

FIG. 24 is a schematic view of the general assembly of a prior art coupling;

fig. 25 is a sectional view taken along the line N-N in fig. 24.

Detailed Description

The telescopic drum tooth type coupling according to the present invention will be described in detail with reference to the accompanying drawings and embodiments.

Example 1

As shown in fig. 1, 2, 3, and 4, the present invention relates to a novel telescopic drum-shaped tooth-type coupling, which comprises a roller end assembly, a shaft assembly, and a tooth end assembly, wherein the roller end assembly comprises an external gear shaft sleeve 1, an internal gear ring 2, a compression ring 3, and a blank cap 4; external tooth axle sleeve 1 passes through the gear pair with ring gear 2 and is connected, and external tooth axle sleeve 1, clamping ring 3, stifle 4 three pass through helicitic texture I and connect.

The utility model discloses with present integral stifle split one-tenth clamping ring and stifle split type structure in the roller end subassembly of shaft coupling for the stifle no longer has the radian, consequently its material utilization is high, makes the degree of difficulty low, with low costs.

The connection method of the external gear sleeve, the press ring, and the blank cap is described in detail below.

Firstly, a long bolt connection mode: as shown in fig. 1, the thread structure i comprises a screw hole i 8 on the external tooth shaft sleeve 1, a screw hole ii 9 on the press ring 3, and a screw hole iii 10 on the blank cap 4; the long bolt penetrates through the screw hole III 10 and the screw hole II 9 and then is screwed with the screw hole I8.

The connecting mode is that the long bolt is directly connected with the external tooth shaft sleeve 1, the pressing ring 3 and the blank cap 4, and the operation is simple.

II, double-thread pair connection mode: as shown in fig. 2, the thread structure i comprises an external thread ii 15 at the right end of the external gear shaft sleeve 1, an internal thread ii 16 at the left end of the press ring 3, an external thread i 13 at the right end, and an internal thread i 14 at the left end of the blank cap 4; the external thread II 15 is connected with the internal thread II 16 through a thread pair, and the external thread I13 is connected with the internal thread I14 through a thread pair.

The connecting mode is that the external gear shaft sleeve 1, the pressure ring 3 and the blank cap 4 are locked by threads between every two parts, and a bolt is not needed, so that the structure is simple.

Thirdly, the bolt and the thread pair have two connection modes: firstly, as shown in fig. 3, a thread structure I comprises a screw hole I8 on an external tooth shaft sleeve 1, a screw hole IV 11 and a counter bore 12 on a pressure ring 3, an external thread I13 at the right end of the pressure ring 3 and an internal thread I14 at the left end of a blank cap 4; the bolt penetrates through the counter bore 12 and the screw hole IV 11 and then is screwed with the screw hole I8, and the external thread I13 is connected with the internal thread I14 through a thread pair; secondly, as shown in fig. 4, the thread structure I comprises an external thread II 15 at the right end of the external tooth shaft sleeve 1, an internal thread II 16 and a screw hole V17 at the left end of the pressing ring 3, and a screw hole III 10 on the blank cap 4; the external thread II 15 is connected with the internal thread II 16 through a thread pair, and the bolt penetrates through the screw hole III 10 and then is screwed with the screw hole V17.

The first connection mode is that a short bolt is connected with two parts of the external tooth shaft sleeve 1 and the pressure ring 3, the pressure ring 3 and the blank cap 4 are locked by screw threads, and the second connection mode is used for locking the two parts of the external tooth shaft sleeve 1 and the pressure ring 3 by screw threads; the short bolt is connected with two parts, namely a compression ring 3 and a blank cap 4; the bolt and thread pair connection mode has the advantages of bolt connection and thread connection, and is simple to operate and simple in structure.

Fourthly, after the shaft coupling worked for a long time, probably take place to become flexible between the three parts of the stay bolt that fig. 1 shows and external tooth axle sleeve 1, clamping ring 3, stifle 4, consequently improve above-mentioned structure, consequently thread structure I still includes the end connection: firstly, as shown in fig. 5 and 6, the end face connection comprises a plurality of key grooves on the right end face of the pressure ring 3, a plurality of key grooves on the left end face of the blank cap 4 and a plurality of end face keys 33, the number of the key grooves is equal and the key grooves are uniformly distributed, and the end face keys 33 are clamped in the two key grooves and are tightly pressed on the pressure ring 3 through screws; secondly, as shown in fig. 7 and 8, the end face connection comprises end face teeth on the right end face of the pressing ring 3 and end face teeth on the left end face of the blank cap 4, and the two end face teeth 34 are meshed with each other.

After the end face connection is increased by the long bolt connection mode, the connection among the three parts of the external gear shaft sleeve 1, the pressure ring 3 and the blank cap 4 is firm, and the reliability is higher.

Example 2

As shown in fig. 9, 10, 11, 12, 13, 14, 15, and 16, the drum tooth coupling of the present invention: the shaft assembly comprises a connecting shaft 5, a retainer 6, a front shaft lug and a rear shaft lug 7, a bearing is arranged between the retainer 6 and the connecting shaft 5, and the shaft lugs 7 are connected with the retainer 6 through a connecting structure II.

The utility model discloses the split of integral holder that will have now in the axle subassembly of shaft coupling becomes holder and two split type structures of journal stirrup, and material utilization is high, low in manufacturing cost, and only need change the journal stirrup when the journal stirrup fracture and need not pull down right gland, lock nut and change the holder, easy maintenance, greatly reduced repair time and cost of overhaul.

The connection between the retainer 6 and the lug 7 will be described in detail below.

Firstly, a threaded connection mode: as shown in fig. 9 and 10, the retainer includes screw holes 22 on the front and rear end faces of the retainer 6, and screw heads 23 on the shaft lugs 7; the threaded head 23 is screwed with the threaded hole 22, and the step surface of the shaft lug 7 is tightly pressed on the end surface of the threaded hole 22.

The connection mode is reliable, and the retainer 6 and the shaft lug 7 are not easy to fall off.

Secondly, welding and connecting mode: as shown in fig. 11 and 12, the connecting structure ii includes cylindrical holes 18 on the front and rear end faces of the retainer 6, and cylindrical heads 19 on the lugs 7; the cylindrical head 19 is inserted into the cylindrical hole 18, the step surface of the shaft lug 7 is tightly pressed on the end surface of the cylindrical hole 18, and the joint of the end surfaces is welded.

The connection mode is reliable, and the retainer 6 and the shaft lug 7 cannot fall off.

Thirdly, the bolt type connection mode has two types: firstly, as shown in fig. 13 and 14, the connecting structure ii comprises rectangular holes 20 on the front end face and the rear end face of the retainer 6 and rectangular heads 21 on the shaft lugs 7; the rectangular head 21 is inserted into the rectangular hole 20, and the step surface of the shaft lug 7 is tightly pressed on the end surface of the rectangular hole 21; secondly, as shown in fig. 15 and 16, the connecting structure II comprises flat holes 35 on the front end face and the rear end face of the retainer 6 and flat heads 36 on the shaft lugs 7; the flat head 36 is inserted into the flat hole 35, and the step surface of the shaft lug 7 is tightly pressed on the end surface of the flat hole 35.

The bolt type connection mode is reliable in connection and convenient to maintain. Wherein a flat-bore connection is more reliable than a rectangular-bore connection.

Example 3

As shown in fig. 17, 18, 19, 20, 21, 22, and 23, a connection structure iii is provided between the ring gear 2 and the connection shaft 5.

The utility model discloses the shaft coupling passes through connection structure III makes the connection of ring gear and connecting axle reliable, does not need often to change the key, has reduced the maintenance cost and the degree of difficulty, has improved work efficiency.

The different connection of the ring gear 2 to the connecting shaft 5 will be described in detail below.

Firstly, a rectangular gear pair connection mode: as shown in fig. 17, the connecting structure iii comprises rectangular inner teeth 24 on the inner hole of the ring gear 2, and rectangular outer teeth 25 on the outer circle of the connecting shaft 5; the rectangular inner teeth 24 are meshed with the rectangular outer teeth 25.

The connection mode is convenient to process, small-diameter centering is adopted, centering precision is easy to guarantee, and the connection mode is suitable for static connection or light-load connection.

Secondly, the connection mode of the involute spline pair is as follows: as shown in fig. 19, the connecting structure iii includes an involute inner spline 26 on the inner hole of the ring gear 2 and an involute outer spline 27 on the outer circle of the connecting shaft 5; involute internal splines 26 mate with involute external splines 27.

The connecting mode has high manufacturing precision, high strength of the root of the spline tooth, small stress concentration and easy centering, and is suitable for connection with larger load, higher centering precision requirement and larger size.

Thirdly, a convex-concave surface connection mode: as shown in fig. 18, the connecting structure iii comprises a plurality of protrusions 28 on the inner hole of the ring gear 2 and a plurality of grooves 29 on the outer circle of the connecting shaft 5; the bulge 28 is embedded in the groove 29; the number of the projections 28 and the number of the grooves 29 are equal and are evenly distributed.

The connection mode is simple and convenient to process and is commonly used for connecting the inner gear ring with interference fit with the shaft.

Fourthly, a flat key connection mode: as shown in fig. 20, 21, 22 and 23, the connecting structure iii includes a plurality of grooves 30 on the inner hole of the ring gear 2, a plurality of grooves 31 on the outer circle of the connecting shaft 5, a plurality of keys, a key connection groove 30 and a groove 31; firstly, as shown in fig. 20, when the key is a B-type key 32, the number of the grooves 30, the grooves 31 and the keys are two and are distributed at 120 degrees; secondly, as shown in fig. 21, when the key is a B1 type key 35, the number of the grooves 30, the grooves 31 and the keys are two and are distributed at 180 degrees; thirdly, as shown in fig. 22 and 23, when the key is a D-shaped key 36, the number of the grooves 30, the grooves 31 and the keys are two, and the grooves are distributed at 120 degrees or 180 degrees.

The connection mode is simple and convenient to process and is commonly used for connection of the inner gear ring with interference fit and the shaft. Wherein, the tangential key connection mode is often used in the occasion that the load is very big, centering requirement is not tight.

The utility model discloses among the concertina type cydariform tooth-like shaft coupling: the thread structures I of the external gear shaft sleeve 1, the pressure ring 3 and the blank cap 4 are 6 in total, the connecting structures II between the shaft lugs 7 and the retainer 6 are 4 in total, and the connecting structures III between the inner gear ring 2 and the connecting shaft 5 are 6 in total. Therefore, theoretically, the present invention combines three structures into one body, and there may be 6 × 4 × 6 ═ 144 forms.

The telescopic drum-shaped tooth type coupler of the utility model has the advantages that the structure of the coupler is simple, the processing difficulty is small, the material utilization rate is high, and the manufacturing cost is reduced through the different connection modes of the external tooth shaft sleeve, the compression ring and the blank cap, the different connection modes of the retainer and the shaft lug and the different connection modes of the inner gear ring and the connecting shaft; meanwhile, the parts are not easy to damage, the parts are convenient to maintain after being damaged, the maintenance time is shortened, the production cost and the maintenance cost of the rod and wire production line are reduced, the production efficiency of the rod and wire production line is improved, and the requirements of the rod and wire production line are met.

Claims (14)

1. The utility model provides a novel concertina type cydariform tooth coupling, it includes roller end subassembly, axle subassembly and tooth end subassembly, characterized by: the roller end component comprises an external gear shaft sleeve (1), an internal gear ring (2), a pressure ring (3) and a blank cap (4); external tooth axle sleeve (1) is connected through the gear pair with ring gear (2), and external tooth axle sleeve (1), clamping ring (3), stifle (4) three pass through helicitic texture I and connect.

2. The telescopic drum tooth coupling of claim 1, wherein: the thread structure I is in a long bolt connection mode: the device comprises a screw hole I (8) on an external gear shaft sleeve (1), a screw hole II (9) on a pressure ring (3) and a screw hole III (10) on a blank cap (4); the long bolt penetrates through the screw hole III (10) and the screw hole II (9) and then is screwed with the screw hole I (8).

3. The telescopic drum tooth coupling of claim 1, wherein: the thread structure I adopts a double-thread auxiliary connection mode: the oil seal ring comprises an external thread II (15) at the right end of an external tooth shaft sleeve (1), an internal thread II (16) at the left end of a pressure ring (3), an external thread I (13) at the right end and an internal thread I (14) at the left end of a blank cap (4); the external thread II (15) is connected with the internal thread II (16) through a thread pair, and the external thread I (13) is connected with the internal thread I (14) through a thread pair.

4. The telescopic drum tooth coupling of claim 1, wherein: the thread structure I is in a bolt and thread pair connection mode: the device comprises a screw hole I (8) on an external gear shaft sleeve (1), a screw hole IV (11) and a counter bore (12) on a pressure ring (3), an external thread I (13) at the right end of the pressure ring (3) and an internal thread I (14) at the left end of a blank cap (4); the bolt penetrates through the counter bore (12) and the screw hole IV (11) and then is screwed with the screw hole I (8), and the external thread I (13) is connected with the internal thread I (14) through a thread pair; the device comprises an external thread II (15) at the right end of an external gear shaft sleeve (1), an internal thread II (16) and a screw hole V (17) at the left end of a pressure ring (3), and a screw hole III (10) on a blank cap (4); the external thread II (15) is connected with the internal thread II (16) through a thread pair, and the bolt penetrates through the screw hole III (10) and then is screwed with the screw hole V (17).

5. The telescopic drum tooth coupling of claim 2, wherein: thread structure I still includes the end connection: the end face connection comprises a plurality of key grooves on the right end face of the pressing ring (3), a plurality of key grooves on the left end face of the blank cap (4) and a plurality of end face keys (33), the number of the key grooves is equal to that of the key grooves, the key grooves are uniformly distributed, and the end face keys (33) are clamped in the two key grooves and are tightly pressed on the pressing ring (3) through screws; the end face connection comprises end face teeth on the right end face of the pressing ring (3) and end face teeth on the left end face of the blank cap (4), and the two end face teeth (34) are meshed with each other.

6. The telescopic drum tooth coupling of claim 1, wherein: the shaft assembly comprises a connecting shaft (5), a retainer (6) and a front shaft lug and a rear shaft lug (7), a bearing is arranged between the retainer (6) and the connecting shaft (5), and the shaft lugs (7) are connected with the retainer (6) through a connecting structure II.

7. The telescopic drum tooth coupling of claim 6, wherein: connection structure II is threaded connection mode: the novel bearing comprises threaded holes (22) on the front end face and the rear end face of a retainer (6) and threaded heads (23) on shaft lugs (7); the threaded head (23) is screwed with the threaded hole (22), and the step surface of the shaft lug (7) is tightly pressed on the end surface of the threaded hole (22).

8. The telescopic drum tooth coupling of claim 6, wherein: connection structure II is welded connection mode: the device comprises cylindrical holes (18) on the front end surface and the rear end surface of a retainer (6) and cylindrical heads (19) on shaft lugs (7); the cylindrical head (19) is inserted into the cylindrical hole (18), the step surface of the shaft lug (7) is tightly pressed on the end surface of the cylindrical hole (18), and the joint of the end surfaces is welded.

9. The telescopic drum tooth coupling of claim 6, wherein: the connecting structure II is in a bolt type connecting mode; the connecting structure II comprises rectangular holes (20) on the front end face and the rear end face of the retainer (6) and rectangular heads (21) on the shaft lugs (7); the rectangular head (21) is inserted into the rectangular hole (20), and the step surface of the shaft lug (7) is tightly pressed on the end surface of the rectangular head (21); the connecting structure II comprises flat holes (35) on the front end face and the rear end face of the retainer (6) and flat heads (36) on the shaft lugs (7); the flat head (36) is inserted into the flat hole (35), and the step surface of the shaft lug (7) is tightly pressed on the end surface of the flat hole (35).

10. The telescopic drum tooth coupling of claim 6, wherein: a connecting structure III is arranged between the inner gear ring (2) and the connecting shaft (5).

11. The telescopic drum tooth coupling of claim 10, wherein: the connecting structure III is a rectangular gear pair connecting mode: the inner gear comprises rectangular inner teeth (24) on an inner hole of an inner gear ring (2) and rectangular outer teeth (25) on an excircle of a connecting shaft (5); the rectangular internal teeth (24) are meshed with the rectangular external teeth (25).

12. The telescopic drum tooth coupling of claim 10, wherein: the connection structure III is in an involute spline pair connection mode: the connecting device comprises an involute inner spline (26) on an inner hole of an inner gear ring (2) and an involute outer spline (27) on an excircle of a connecting shaft (5); the involute internal spline (26) is matched with the involute external spline (27).

13. The telescopic drum tooth coupling of claim 10, wherein: connection structure III is the concave-convex surface connected mode: the inner ring gear comprises a plurality of bulges (28) on an inner hole of an inner ring gear (2) and a plurality of grooves I (29) on the excircle of a connecting shaft (5); the bulge (28) is embedded in the groove I (29); the number of the bulges (28) and the number of the grooves I (29) are equal and are evenly distributed.

14. The telescopic drum tooth coupling of claim 10, wherein: the connecting structure III is in key connection: the inner ring gear comprises a plurality of grooves II (30) on an inner hole of an inner ring gear (2), a plurality of grooves III (31) on the excircle of a connecting shaft (5), a plurality of keys, and a key connection groove II (30) and a groove III (31); when the key is a B-type key (32), the number of the grooves II (30), the number of the grooves III (31) and the number of the keys are two and are distributed at 120 degrees; when the key is a B1 type key (37), the number of the grooves II (30), the grooves III (31) and the keys are two and are distributed at 180 degrees; when the key is a D-shaped key (38), the number of the grooves II (30), the grooves III (31) and the keys is two, and the grooves are distributed at 120 degrees or 180 degrees.

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