CN111946700B

CN111946700B - Pulse torque generation unit

Info

Publication number: CN111946700B
Application number: CN202010981515.XA
Authority: CN
Inventors: 徐依婷; 徐福初
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2022-04-08
Anticipated expiration: 2040-09-17
Also published as: CN111946700A

Abstract

The invention provides a pulse torque generating unit, and belongs to the technical field of machinery. It has solved the current not good problem of torque generator precision. The pulse torque generation unit comprises a cylinder and a main shaft, wherein the lower end of the main shaft is rotationally connected with the cylinder, a ring body is formed on the outer wall of the upper end of the main shaft, two driving rods symmetrically arranged along the central line of the cylinder are arranged on the cylinder, a ball body is arranged at the upper end of each driving rod, the ball body is arranged between the ring body and the main shaft, the lower end of each driving rod is hinged with the cylinder through a pin shaft so that the ball body can swing back and forth between the ring body and the main shaft, a first cambered surface and a second cambered surface are respectively arranged on the inner side wall of the ring body and the outer side wall of the main shaft, the first cambered surface and the second cambered surface are respectively provided with two parts, the ball body can be contacted with the first cambered surface or the second cambered surface when the cylinder rotates, and the contact modes of the ball body with the first cambered surface and the second cambered surface are both in line contact; an adjusting mechanism for changing the contact pressure between the ball body and the first cambered surface and the second cambered surface by adjusting the swing position of the driving rod is arranged in the column body. The pulse torque generating unit has high precision.

Description

Pulse torque generation unit

Technical Field

The invention belongs to the technical field of machinery, and relates to a torque generation unit, in particular to a pulse torque generation unit.

Background

A torque wrench is one of wrenches, and a pressing power source can be divided into: an electric torque wrench, a pneumatic torque wrench, a hydraulic torque wrench, and a manual torque wrench.

The impulse torque generator is an important component unit of the torque wrench, and the structure of the impulse torque generator is as disclosed in Chinese patent library, the hydraulic torque impulse generator (application number: 2006100427110) for the torque wrench comprises a main shaft, a hydraulic cylinder, two blades inserted in blade grooves of the main shaft, a front end cover and a rear end cover of the hydraulic cylinder, the blades are composed of a substrate and a rolling pin, the top end of the outer edge of the substrate is provided with a through groove parallel to the plane of the substrate, and the rolling pin is inserted in the through groove.

In the above generator, the friction position and the hydraulic position of the blade with the hydraulic cylinder are relatively close, so that the hydraulic temperature is likely to rise to cause viscosity change, thereby generating fluctuation in the intensity of the generated impact torque and affecting the working accuracy.

Disclosure of Invention

The invention aims to provide a pulse torque generating unit with high precision aiming at the problems in the prior art.

The purpose of the invention can be realized by the following technical scheme: the pulse torque generation unit comprises a cylinder and a main shaft which are coaxially arranged, and the lower end of the main shaft is rotationally connected with the cylinder; the cylinder is provided with two driving rods symmetrically arranged along the center line of the cylinder, the upper end of each driving rod is a sphere, the sphere is arranged between the ring body and the main shaft, the lower end of each driving rod is hinged with the cylinder through a pin shaft so that the sphere can swing back and forth between the inner side wall of the ring body and the outer side wall of the main shaft, the inner side wall of the ring body and the outer side wall of the main shaft are respectively provided with a first cambered surface and a second cambered surface which are matched with the sphere, the first cambered surface and the second cambered surface are both provided with two parts and are alternately distributed along the circumferential direction of the main shaft, the sphere can be contacted with the first cambered surface or the second cambered surface when the cylinder rotates, and the contact modes of the sphere and the first cambered surface and the second cambered surface are both line contact; an adjusting mechanism for changing the contact pressure between the ball body and the first cambered surface and the second cambered surface by adjusting the swing position of the driving rod is arranged in the column body.

When the device is used, the cylinder body is driven by the driving source to rotate, the driving rod rotates along with the cylinder body, and the sphere is contacted with the first cambered surface or the second cambered surface to generate rotating torque and output the rotating torque through the main shaft; the adjusting mechanism is used for adjusting the contact pressure between the ball body and the first cambered surface and the second cambered surface to adjust the torque output so as to meet different working conditions.

In this application, the spheroid distributes and exists certain distance with these two of adjustment mechanism in the main part axial with the contact site of cambered surface one or cambered surface two to the high temperature that effectively reduces the contact friction and produce ensures adjustment mechanism steady operation to adjustment mechanism's influence, improves this moment of torsion generating unit's job stabilization nature and precision.

In the pulse torque generating unit, the adjusting mechanism comprises a first cavity, a flow channel and a second cavity which are arranged in the column body, the length of the flow channel extends along the axial direction of the column body, the upper end and the lower end of the flow passage are respectively communicated with the first cavity and the second cavity, slide holes which penetrate through the first cavity and the second cavity along the radial direction of the column body are formed in the first cavity and the second cavity, the two slide holes are arranged in parallel along the axial direction of the column body, two ends of the slide holes are respectively opposite to the two driving rods, the pin shaft is positioned between the two sliding holes, the two ends of the sliding hole are both internally provided with a top post which can slide along the radial direction of the post body, the outer end of the top post extends out of the sliding hole, and a sealing is formed between the side wall of the top column and the wall of the sliding hole, the column body is also provided with an adjusting piece capable of changing the flow of the flow passage, a closed cavity for filling hydraulic oil is formed among the cavity I, the cavity II, the flow passage, the adjusting piece and the top column, and when the ball body is contacted with the cambered surface I or the cambered surface II, the outer ends of all the ejection columns are pressed on the corresponding driving rods. When in use, the following description is made when the sphere is in contact with the cambered surface: the driving rod has a small-amplitude swinging trend inwards to promote the top column at the upper part to move inwards and the top column at the lower part to move outwards; when the flow of the flow passage is small, the hydraulic oil in the first cavity exerts strong support on the upper ejection column, so that the contact pressure between the ball body and the first cambered surface is large to output large torque, and on the contrary, when the flow of the flow passage is large, the contact pressure is small to cause small torque output.

The hydraulic oil is adopted to support the jacking column, so that the hydraulic jacking device has the advantage of good working stability, and further improves the working precision.

In the wall pulse torque generation unit, the outer wall of the inner end of the top column is provided with an annular groove, the annular groove is coaxial with the top column, an o-shaped ring is arranged in the annular groove, and the peripheral surface of the o-shaped ring is abutted against the wall of the sliding hole, so that reliable sealing is formed between the top column and the sliding hole.

In the pulse torque generation unit, the axial section of the outer end of the ejection column is in the shape of an arc, the driving rod is provided with a strip-shaped groove for the ejection column to abut against, the length of the groove extends along the length direction of the driving rod, and the cross section of the groove is in the shape of an arc matched with the outer end of the ejection column. By adopting the design, the insertion of the ejection column is guided, the contact area between the ejection column and the driving rod can be increased, the ejection column can apply force on the driving rod more stably, and the working precision and stability are further improved.

In the pulse torque generation unit, a radial through hole is formed in the side wall of the column in a penetrating mode, one end of the radial through hole is communicated with the flow channel, the adjusting piece is a bolt connected in the radial through hole in a threaded mode, and the rod portion of the bolt extends into the flow channel. The length of the bolt rod part extending into the flow channel is changed by rotating the bolt so as to change the flow channel overflowing width, so that the flow passing through the flow channel is changed, and the novel flow channel has the advantages of simple structure and convenience in use.

In the pulse torque generation unit, the bolt forms a seal with the wall of the radial through hole through the first seal ring, and the first seal ring is positioned between the flow channel and the head of the bolt.

As another scheme, in the pulse torque generating unit, a radial through hole is formed in the side wall of the cylinder in a penetrating manner, one end of the radial through hole is communicated with the flow channel, the adjusting piece is a sealing rod inserted into the radial through hole, the inner end of the sealing rod extends into the flow channel, the outer end of the sealing rod extends out of the radial through hole, and the side wall of the sealing rod is in close contact with the hole wall of the radial through hole to form sealing.

In foretell pulse torque generation unit, the cylinder includes the drive shaft and is the body of column and possess the cavity, and drive shaft and body are coaxial, cavity bottom opening, and the drive shaft upper end is sealed to be linked firmly in the cavity, and forms foretell cavity two between cavity and the drive shaft, and foretell cavity one and runner all are located the body.

In the pulse torque generation unit, the cavity is internally connected with the compression ring in a threaded manner, the compression ring is sleeved outside the driving shaft, the outer side wall of the driving shaft is provided with the annular convex shoulder, the annular convex shoulder is tightly pressed between the inner wall of the cavity and the annular convex shoulder, and the annular convex shoulder forms sealing with the inner wall of the cavity through the second sealing ring. The design detachable clamping ring location drive shaft can be convenient for the change of drive shaft type, possesses better practicality.

In foretell impulse torque generation unit, be equipped with the two bar grooves that are used for holding two actuating levers respectively on the cylinder lateral wall, bar groove length extends along the cylinder axial, and bar groove upper end has the opening that supplies the actuating lever upper end to stretch out. Design the bar groove and hold the actuating lever to effectively reduce the distance between each spare part, make the compactness that whole structure becomes, reduce the space and occupy.

As another scheme, in the above pulse torque generating unit, the driving rod is fixedly connected with the pin shaft, the cylinder body is internally provided with an inner cavity, the adjusting mechanism comprises two micro motors arranged in the inner cavity, main shafts of the two micro motors extend out of the inner cavity and are respectively connected with the two pin shafts, and the pin shaft can rotate around the axis of the pin shaft under the driving of the micro motors.

In foretell impulse torque generating unit, run through on the cylinder lateral wall and be equipped with the oil filler point with the closed cavity intercommunication, and can dismantle on the cylinder and be fixed with the shutoff piece that is used for shutoff oil filler point to hydraulic oil pours into.

Compared with the prior art, the pulse torque generation unit has the following advantages:

1. the contact part of the ball body and the first cambered surface or the second cambered surface and the adjusting mechanism formed by hydraulic oil are distributed in the axial direction of the main body and have a certain distance, so that the influence of high temperature generated by contact friction on the adjusting mechanism is effectively reduced, the stable operation of the adjusting mechanism is ensured, and the working stability and the precision of the torque generating unit are improved.

2. Adjustment mechanism sets up inside the cylinder, and sets up the bar groove that is used for holding the actuating lever on the cylinder lateral wall to effectively reduce the distance between each spare part, make comparatively compact that whole structure becomes, make whole unit miniaturization, reduce the space and occupy.

Drawings

Fig. 1 is a schematic perspective view of a pulse torque generation unit.

Fig. 2 is a schematic sectional structure view of the impulse torque generating unit.

Fig. 3 is a schematic view of the position structure of the adjusting member.

Fig. 4 is a perspective view of the main shaft.

Fig. 5 is a schematic view of a connection structure of the driving rod and the cylinder.

Fig. 6 is a perspective view of the drive rod.

In the figure, 1, a housing; 2. a cylinder; 2a, a body; 2a1, cavity one; 2a2, flow channel; 2a3, radial through hole; 2a4, strip groove; 2b, a drive shaft; 2b1, annular shoulder; 2c, a cavity II; 2d, a slide hole; 2e, pressing a ring; 2f, a sealing ring II; 3. a main shaft; 3a, a ring body; 3a1, arc one; 3b, a cambered surface II; 4. a bushing; 5. a drive rod; 5a, a sphere; 5b, a groove; 6. a pin shaft; 7. a top pillar; 8. an adjustment member; 8a, a first sealing ring; 9. an o-shaped ring; 10. a decorative member; 11. a closure.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1 and 2, the present impulse torque generating unit includes a housing 1, and a cylinder 2 and a main shaft 3 provided in the housing 1. Wherein, the shell 1 is cylindrical and has two open ends. The column body 2, the shell 1 and the main shaft 3 are coaxially arranged, the lower end of the main shaft 3 is rotatably connected with the column body 2, and the upper end of the main shaft 3 extends out of the shell 1. In the embodiment, the lower end of the main shaft 3 is rotationally connected with the cylinder 2 through bearings, two bearings are arranged along the axial direction of the main shaft 3, and the two bearings are respectively a rolling bearing and a plane bearing from bottom to top; a bush 4 is arranged between the upper port of the shell 1 and the main shaft 3; the lower end of the cylinder 2 extends out of the shell 1.

Specifically, as shown in fig. 2, 4 and 5, a ring body 3a is formed on an outer wall of an upper end of the main shaft 3, and the ring body 3a is coaxial with the main shaft 3. Preferably, the axial section of the ring body 3a is L-shaped, the inner side wall of the ring body 3a is substantially elliptical, and the outer side wall of the main shaft 3 opposite to the inner side wall of the ring body 3a is also substantially elliptical. As shown in fig. 1, two driving rods 5 are symmetrically arranged on the column 2 along the center line of the column 2, the upper end of the driving rod 5 is a sphere 5a, and the sphere 5a is located in the ring body 3a and between the ring body 3a and the main shaft 3. The lower end of the driving rod 5 is hinged with the column body 2 through a pin shaft 6, and the axis of the pin shaft 6 is vertical to the axis of the column body 2, so that the ball body 5a can swing between the inner side wall of the ring body 3a and the outer side wall of the main shaft 3 in a reciprocating mode. The inner side wall of the ring body 3a and the outer side wall of the main shaft 3 are respectively provided with a first cambered surface 3a1 and a second cambered surface 3b which are matched with the ball body 5a, the first cambered surface 3a1 and the second cambered surface 3b are both alternately distributed along the circumferential direction of the main shaft 3, when the column body 2 rotates, the ball body 5a can be in contact with the first cambered surface 3a1 or the second cambered surface 3b, and the contact modes of the ball body 5a and the first cambered surface 3a1 and the second cambered surface 3b are both in line contact. An adjusting mechanism for changing the contact pressure between the spherical body 5a and the arc-shaped surface one 3a1 and the arc-shaped surface two 3b by adjusting the swing position of the driving rod 5 is arranged in the column body 2.

In the present embodiment, as shown in fig. 2 and 3, the adjusting mechanism includes a first cavity 2a1, a flow channel 2a2, and a second cavity 2c disposed in the column 2. The flow passage 2a2 is strip-shaped, and the length of the flow passage 2a2 extends along the axial direction of the column 2. The upper end and the lower end of the flow passage 2a2 are respectively communicated with the first cavity 2a1 and the second cavity 2 c. And sliding holes 2d which penetrate through the cylinder 2 in the radial direction are formed in the first cavity 2a1 and the second cavity 2c, the two sliding holes 2d are arranged in parallel along the axial direction of the cylinder 2, two ends of each sliding hole 2d are respectively opposite to the two driving rods 5, and the pin shaft 6 is positioned between the two sliding holes 2 d. The two ends of the sliding hole 2d are internally provided with a top column 7 capable of sliding along the radial direction of the column body 2, the outer end of the top column 7 extends out of the sliding hole 2d, and a seal is formed between the side wall of the top column 7 and the wall of the sliding hole 2 d. The column body 2 is further provided with an adjusting piece 8 capable of changing the flow rate of the flow passage 2a2, at this time, a closed cavity for filling hydraulic oil is formed among the cavity I2 a1, the cavity II 2c, the flow passage 2a2, the adjusting piece 8 and the top pillars 7, and when the sphere 5a contacts with the arc surface I3 a1 or the arc surface II 3b, the outer ends of all the top pillars 7 are pressed against the corresponding driving rods 5, so that the swinging position of the driving rods 5 is changed to adjust the contact pressure of the sphere 5a and the arc surface I3 a1 or the arc surface II 3 b.

Wherein the content of the first and second substances,

in the embodiment, the first cavity 2a1 is a bar and has a length extending along the radial direction of the cylinder 2.

The cavity two 2c is formed in the following manner: the column 2 comprises a driving shaft 2b and a body 2a which is cylindrical and provided with a cavity, the main shaft 3, the driving shaft 2b and the body 2a are coaxial, and the body 2a is positioned between the main shaft 3 and the driving shaft 2 b. Wherein, cavity bottom opening, drive shaft 2b upper end seal link firmly in the cavity, and form cavity two 2c between cavity and drive shaft 2b, cavity one 2a1 and runner 2a2 all are located body 2a, and drive shaft 2b lower extreme stretches out shell 1. In this embodiment, the top wall of the driving shaft 2b has a square projection, the cavity has a socket with a shape and a size matching with the projection, and the projection is embedded in the socket. Further, the cavity is internally connected with a pressing ring 2e in a threaded manner, the pressing ring 2e is sleeved outside the driving shaft 2b, an annular shoulder 2b1 is arranged on the outer side wall of the driving shaft 2b, the annular shoulder 2b1 is located between the main shaft 3 and the pressing ring 2e, the annular shoulder 2b1 is tightly pressed between the inner wall of the cavity and the annular shoulder 2b1 to achieve axial limiting, and the annular shoulder 2b1 forms sealing with the inner wall of the cavity through a second sealing ring 2f to further improve the connection stability of the driving shaft 2b and the body 2 a.

The top pillar 7 and the slide hole 2d are sealed as follows: an annular groove is formed in the outer wall of the inner end of the top column 7, the annular groove is coaxial with the top column 7, an o-shaped ring 9 is arranged in the annular groove, and the outer peripheral surface of the o-shaped ring 9 abuts against the hole wall of the sliding hole 2d, so that reliable sealing is formed between the top column 7 and the sliding hole 2 d.

The structure and arrangement of the adjusting member 8 are as follows: the side wall of the body 2a is provided with a radial through hole 2a3 in a penetrating manner, one end of the radial through hole 2a3 is communicated with the flow passage 2a2, the adjusting piece 8 is a bolt in threaded connection with the radial through hole 2a3, the rod part of the bolt extends into the flow passage 2a2, the bolt forms sealing with the wall of the radial through hole 2a3 through a first sealing ring 8a, and the first sealing ring 8a is located between the flow passage 2a2 and the head of the bolt. When the flow channel 2 a-2 is used, the length of the rod part of the bolt extending into the flow channel 2a2 is changed by rotating the bolt so as to change the flow width of the flow channel 2a2, and therefore the flow channel has the advantages of simple structure and convenience in use.

In this embodiment, the bolt rod passes through the cavity two 2c, the number of the first sealing rings 8a is two, and the part of the cavity two 2c through which the bolt rod passes is located between the two first sealing rings 8a, at this time, one of the first sealing rings 8a is disposed on the bolt rod, and the other one is disposed on the bolt head. An operation hole which is right opposite to the head of the bolt penetrates through the shell 1, and the operation hole is blocked by a decorating part 10 which is detachably connected with the shell 1. Wherein, the decoration 10 can be a screw, a plug, etc.

Further, as shown in fig. 2 and 6, the axial cross section of the outer end of the top pillar 7 is arc-shaped, the driving rod 5 is provided with a strip-shaped groove 5b for the top pillar 7 to press, the length of the groove 5b extends along the length direction of the driving rod 5, and the cross section of the groove 5b is arc-shaped matched with the outer end of the top pillar 7. By adopting the design, the insertion of the top column 7 is guided, the contact area between the top column 7 and the driving rod 5 can be increased, and the top column 7 can apply force on the driving rod 5 more stably, so that the working precision and stability are further improved.

As shown in fig. 2 and 5, the outer side wall of the main body 2a is provided with two strip-shaped grooves 2a4 for respectively accommodating the two driving rods 5, the length of the strip-shaped groove 2a4 extends along the axial direction of the column body 2, and the upper end of the strip-shaped groove 2a4 is provided with an opening for extending the upper end of the driving rod 5. At this time, one end of the slide hole 2d extends to the bottom wall of the strip-shaped groove 2a 4. The design of the strip-shaped groove 2a4 for accommodating the driving rod 5 effectively reduces the distance between each part, makes the whole structure become compact, and reduces the space occupation. An oil filling hole communicated with the closed cavity is arranged on the side wall of the column body 2 in a penetrating mode, and a plugging piece 11 used for plugging the oil filling hole is detachably fixed on the column body 2. In this embodiment, the plugging member 11 is a screw screwed in the oil filling hole. Naturally, the plugging piece 11 is a plug, and the side wall of the plug is in close contact with the wall of the oil filling hole to form sealing. In the present embodiment, the oil hole communicates with the second cavity 2 c.

When the device is used, the shell is in a fixed state, the driving shaft 2b is driven by the driving source to rotate, the driving rod 5 rotates along with the column body 2, and the sphere 5a is contacted with the first cambered surface 3a1 or the second cambered surface 3b to generate rotating torque and output the rotating torque through the main shaft 3; the following description will be made when the ball 5a contacts the arc surface one 3a 1: the driving rod 5 has a tendency of swinging inwards slightly, so that the upper support pillar 7 moves inwards and the lower support pillar 7 moves outwards; when the flow rate of the flow passage 2a2 is small, the hydraulic oil in the cavity one 2a1 strongly supports the upper support pillar 7, so that the contact pressure between the ball 5a and the arc surface one 3a1 is large to output large torque, and conversely, when the flow rate of the flow passage 2a2 is large, the contact pressure is small, which results in small torque output.

Example two

The second embodiment is basically the same as the first embodiment in structure and principle, and the difference lies in: the side wall of the column body 2 is provided with a radial through hole 2a3 in a penetrating manner, one end of the radial through hole 2a3 is communicated with the flow channel 2a2, the adjusting piece 8 is a sealing rod inserted into the radial through hole 2a3, the inner end of the sealing rod extends into the flow channel 2a2, the outer end of the sealing rod extends out of the radial through hole 2a3, and the side wall of the sealing rod is tightly contacted with the hole wall of the radial through hole 2a3 to form sealing.

EXAMPLE III

The structure and principle of the third embodiment are basically the same as those of the first embodiment, and the differences are that: the driving rod 5 is fixedly connected with the pin shaft 6, an inner cavity is arranged in the cylinder 2, the adjusting mechanism comprises two micro motors arranged in the inner cavity, main shafts 3 of the two micro motors extend out of the inner cavity and are respectively connected with the two pin shafts 6, and the pin shafts 6 can rotate around the axes of the pin shafts under the driving of the micro motors.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A pulse torque generation unit comprises a cylinder (2) and a main shaft (3) which are coaxially arranged, wherein the lower end of the main shaft (3) is rotatably connected with the cylinder (2), and is characterized in that a ring body (3a) is formed on the outer wall of the upper end of the main shaft (3), and the ring body (3a) is coaxial with the main shaft (3); two driving rods (5) symmetrically arranged along the central line of the column body (2) are arranged on the column body (2), the upper ends of the driving rods (5) are spheres (5a), the sphere (5a) is arranged between the ring body (3a) and the main shaft (3), the lower end of the driving rod (5) is hinged with the cylinder (2) through a pin shaft (6) so that the sphere (5a) can swing back and forth between the inner side wall of the ring body (3a) and the outer side wall of the main shaft (3), the inner side wall of the ring body (3a) and the outer side wall of the main shaft (3) are respectively provided with a first cambered surface (3a1) and a second cambered surface (3b) which are matched with the sphere (5a), the first cambered surface (3a1) and the second cambered surface (3b) are both provided with two cambered surfaces and are alternately distributed along the circumferential direction of the main shaft (3), and the sphere (5a) can be contacted with the first cambered surface (3a1) or the second cambered surface (3b) when the cylinder (2) rotates, the contact modes of the sphere (5a) and the cambered surface I (3a1) and the cambered surface II (3b) are line contact; an adjusting mechanism for changing the contact pressure between the ball (5a) and the cambered surface I (3a1) and the cambered surface II (3b) by adjusting the swinging position of the driving rod (5) is arranged in the column body (2); the lower end of the main shaft (3) is rotationally connected with the cylinder (2) through a bearing.

2. The impulse torque generating unit according to claim 1, wherein the adjusting mechanism comprises a first cavity (2a1), a flow channel (2a2) and a second cavity (2c) which are arranged in the cylinder (2), the length of the flow channel (2a2) extends along the axial direction of the cylinder (2), the upper end and the lower end of the flow channel (2a2) are respectively communicated with the first cavity (2a1) and the second cavity (2c), slide holes (2d) which penetrate along the radial direction of the cylinder (2) are formed in the first cavity (2a1) and the second cavity (2c), the two slide holes (2d) are arranged in parallel along the axial direction of the cylinder (2), two ends of each slide hole (2d) are respectively opposite to the two driving rods (5), the pin shaft (6) is arranged between the two slide holes (2d), two ends of each slide hole (2d) are provided with a top pillar (7) which can slide along the radial direction of the cylinder (2), the outer end of the top pillar (7) extends out of the slide hole (2d), and a seal is formed between the side wall of the top pillar (7) and the slide hole (2d), the column body (2) is also provided with an adjusting piece (8) capable of changing the flow passing through the flow channel (2a2), a closed cavity used for filling hydraulic oil is formed among the cavity I (2a1), the cavity II (2c), the flow channel (2a2), the adjusting piece (8) and the top columns (7), and when the sphere (5a) is in contact with the cambered surface I (3a1) or the cambered surface II (3b), the outer ends of all the top columns (7) are pressed on the corresponding driving rods (5) in a propping mode.

3. The impulse torque generating unit according to claim 2, wherein an annular groove is formed in an outer wall of an inner end of the top pillar (7), the annular groove is coaxial with the top pillar (7), an o-shaped ring (9) is arranged in the annular groove, and an outer peripheral surface of the o-shaped ring (9) abuts against a hole wall of the slide hole (2 d).

4. The impulse torque generating unit according to claim 2 or 3, wherein the axial cross-section of the outer end of the top pillar (7) is arc-shaped, a strip-shaped groove (5b) for the top pillar (7) to press is provided on the driving rod (5), the length of the groove (5b) extends along the length direction of the driving rod (5), and the cross-section of the groove (5b) is arc-shaped matching the outer end of the top pillar (7).

5. The impulse torque generating unit according to claim 2 or 3, wherein a radial through hole (2a3) is formed through a side wall of the cylinder (2), one end of the radial through hole (2a3) is communicated with the flow passage (2a2), the adjusting member (8) is a bolt screwed in the radial through hole (2a3), and a bolt rod portion extends into the flow passage (2a 2).

6. The impulse torque generating unit according to claim 5, wherein the bolt is sealed with the wall of the radial through hole (2a3) by a first sealing ring (8a), and the first sealing ring (8a) is located between the flow passage (2a2) and the head of the bolt.

7. The impulse torque generating unit according to claim 2, wherein the cylinder (2) comprises a driving shaft (2b) and a cylindrical body (2a) having a cavity, the driving shaft (2b) and the body (2a) are coaxial, the bottom of the cavity is open, the upper end of the driving shaft (2b) is hermetically connected in the cavity, a second cavity (2c) is formed between the cavity and the driving shaft (2b), and the first cavity (2a1) and the flow channel (2a2) are both located on the body (2 a).

8. The impulse torque generating unit according to claim 7, characterized in that a press ring (2e) is connected to the cavity in a threaded manner, the press ring (2e) is sleeved outside the driving shaft (2b), the driving shaft (2b) has an annular shoulder (2b1) on the outer side wall, the annular shoulder (2b1) is compressed between the inner wall of the cavity and the press ring (2e), and the annular shoulder (2b1) forms a seal with the inner wall of the cavity by a second sealing ring (2 f).

9. The impulse torque generating unit according to claim 1, 2 or 3, wherein the outer side wall of the cylinder (2) is provided with two strip-shaped grooves (2a4) for respectively accommodating the two driving rods (5), the length of the strip-shaped groove (2a4) extends along the axial direction of the cylinder (2), and the upper end of the strip-shaped groove (2a4) is provided with an opening for extending the upper end of the driving rod (5).

10. The impulse torque generating unit according to claim 2 or 3, wherein an oil hole communicating with the closed cavity is formed through a sidewall of the cylinder (2), and a blocking member (11) for blocking the oil hole is detachably fixed to the cylinder (2).