CN106895771A - A kind of coal mine hydraulic supporting arranges linearity testing apparatus - Google Patents

Abstract

The invention discloses a coal mine hydraulic support arrangement straightness detection device. The device is installed on the top plate of the hydraulic support and connects the detection mechanisms on each hydraulic support in series through the steel wire rope passing through the mechanism rope ring. One end of the steel wire rope is led out by a pull-type displacement sensor. And fixed at the end of the working surface, the other end is connected with the computer and other terminals; in the detection mechanism, the sleeve is fixedly supported by the base, the main shaft passes through the sleeve and the spring and penetrates into the hollow cylinder of the base, and the other end is connected with the rope ring Fixed; the slider type displacement sensor is fixed on the sleeve by bolts, and the arc surface auxiliary slider slides in contact with the main shaft boss through the arc surface support seat; the angle sensor is fixed on the end face of the sleeve, and contacts the main shaft track groove through the ball in the groove Cooperate. The spindle drives the slider to move, the sensor detects the slider movement to obtain the linear displacement; the angle sensor obtains the angular displacement of the spindle rotation, the detection speed is fast, and the result is accurate and reliable.

Description

A straightness detection device for coal mine hydraulic support arrangement

technical field

The invention relates to a straightness detection device of a working face hydraulic support group, in particular to a detection device using a linear sensor and an angle sensor.

Background technique

The hydraulic support is an important support equipment in the mechanized coal mining face. During work, in order to realize the normal operation of the working face, it is necessary to maintain a certain straightness between multiple hydraulic supports, that is, it is required that the hydraulic supports of multiple working faces are basically in the same position. in a straight line. At the same time, the working face is constantly changing during the coal mining process. After the hydraulic support is pushed and slipped, the straightness of the support changes. Readjust to ensure coal mining quality.

Contents of the invention

Purpose of the invention: Aiming at the above-mentioned prior art, a straightness detection device for coal mine hydraulic support arrangement is proposed, which can automatically detect the straightness of all hydraulic supports at one time.

Technical solution: A coal mine hydraulic support arrangement straightness detection device, including a posture detection mechanism and a cable-type displacement sensor, the posture detection mechanism can detect vertical displacement and horizontal rotation, and the posture detection mechanism is located at A rope-threading ring at the bottom senses vertical displacement and horizontal rotation; two posture detection mechanisms are installed on each hydraulic support, and the two posture detection mechanisms are arranged side by side at intervals and fixed on the lower surface of the top beam of the hydraulic support; The main body of the stay-wire displacement sensor is fixed at one end of the coal mining face, and its output wire rope passes through the rope-threading rings of all position and posture detection mechanisms fixed on the hydraulic support successively from the main body of the stay-wire sensor. The rope head is fixed at the other end of the coal face end; in the initial state, the steel wire rope passes through the centers of all rope-threading rings, and the plane where each rope-threading ring is located is perpendicular to the steel wire rope.

Further, the pose detection mechanism includes a base, a sleeve, and a main shaft, the sleeve is vertically arranged and fixed on the base, the main shaft is placed in the sleeve, and the main shaft and the sleeve There is damping between them, and the main shaft can be displaced vertically and rotated horizontally relative to the sleeve. A slider-type displacement sensor is provided on the side of the sleeve, and an angle sensor is provided at the bottom of the sleeve.

Further, the base includes a top plate and a hollow cylinder vertically arranged in the center of the top plate; a vertical sliding groove is provided on the side of the sleeve, and a slider-type displacement sensor mounting seat is provided on the outside of the sleeve. The mounting seat is also provided with a strip groove at the position facing the sliding groove, and the bottom of the sleeve is provided with an end cover with a central through hole; the axis center of the main shaft is provided with a circular boss, the The annular boss is provided with a circumferential rolling groove along the circumference; the main shaft is located at the upper half of the annular boss, which is the groove-free end of the main shaft, and the main shaft is located at the lower half of the annular boss is the grooved end of the main shaft, and the grooved end of the main shaft is provided with an axial rolling groove along the axial direction of the main shaft;

The top end of the sleeve is sleeved on the hollow cylinder of the base, the non-grooved end of the main shaft passes through the first spring, and its end extends into the hollow cylinder, the non-grooved end of the main shaft and the hollow cylinder on the base There is no damping between them, the grooved end of the main shaft passes through the second spring, and its end passes through the central through hole of the end cover, and the rope threading ring is fixed on the end of the grooved end of the main shaft;

The slider type displacement sensor includes a miniature slider for sensing linear displacement, and the miniature slider is fixed on an arc auxiliary slider, one end surface of the arc auxiliary slider is an arc surface, and the arc The shape surface fits with the outer circumference of the annular boss, and the micro-slider is fixed on the other end surface opposite to the arc surface, and the arc surface is provided with a square groove, and the square groove The ball is connected with the circumferential rolling groove of the annular boss, and the arc-shaped auxiliary slider can slide around the annular boss in the circumferential direction.

Further, the square groove of the arc-shaped auxiliary slider accommodates two balls along the horizontal direction, the height of the square groove is in clearance fit with the balls, and the depth of the square groove is smaller than the diameter of the balls, The cross-section of the circumferential rolling groove of the annular boss is semicircular, and its diameter is equal to the diameter of the ball. The two sides of the arc-shaped auxiliary slider are also provided with I-shaped limit grooves. The arc-shaped auxiliary sliding block can slide up and down in the sliding groove through the fitting of the I-shaped limiting groove with the sleeve wall and the mounting seat.

Further, the angle sensor includes an annular rotating body for sensing the horizontal rotation angle, the end of the main shaft passes through the annular rotating body, and a pin hole is arranged inside the annular rotating body, The ball is constrained in the pin hole and the axial rolling groove simultaneously by the pin, and the pin is in interference fit with the pin hole.

Further, the number of the axial rolling grooves is multiple, and the multiple axial rolling grooves are evenly distributed along the circumference of the main shaft, and the circular rotating body includes multiple sets of axial rolling grooves that cooperate with the axial rolling grooves. Pin holes, balls and pins.

Beneficial effects: the present invention is a device capable of automatically detecting the straightness of a hydraulic support. The displacement is transmitted to the control terminal through a cable-type displacement sensor, which can automatically detect the straightness of all hydraulic supports at one time, taking into account both efficiency and accuracy, and can Improve the refined and automated production of coal mines.

Description of drawings

Figure 1 is a layout diagram of the position and posture detection mechanism of the hydraulic support;

Fig. 2 is a telescopic state diagram of the steel wire rope during the support transformation state;

Fig. 3 is an assembly sectional view of the pose detection mechanism;

Fig. 4 is a main shaft structure diagram;

Figure 5 is a partial enlarged view of the assembly of the angle sensor;

Figure 6 is a partial enlarged view of the assembly of the arcuate micro-slider;

Fig. 7 is an assembly sectional view of the arcuate micro-slider;

Fig. 8 (a) is the front view of the arc miniature slider, and Fig. 8 (b) is the top view of the arc miniature slider;

Fig. 9 is a schematic diagram of the sleeve structure.

detailed description

The present invention will be further explained below in conjunction with the accompanying drawings.

As shown in Figure 1, a coal mine hydraulic support arrangement straightness detection device includes a position and posture detection mechanism 10 and a cable-type displacement sensor 11, the position and posture detection mechanism 10 can detect vertical displacement and horizontal rotation, and the position and posture detection mechanism 10 senses vertical displacement and horizontal rotation through a rope loop at the bottom. Two posture detection mechanisms 10 are installed on each hydraulic support, and the two posture detection mechanisms are arranged side by side at intervals, and are fixed on the lower surface of the top beam of the hydraulic support, and are located in the middle of the top beam, away from the column working area. The range of the pull-wire displacement sensor 11 is greater than the length of the working face. The main body of the pull-wire displacement sensor 11 is fixed at one end of the coal mining face, and its output wire rope 9 passes through the main body of the pull-wire sensor successively through all positions fixed on the hydraulic support. After detecting the rope-threading rings of the mechanism, the rope head of the steel wire rope 9 is fixed at the other end of the coal mining face; in the initial state, the steel wire rope 9 passes through the centers of all rope-threading rings, and the plane where each rope-threading ring is located is vertical to the steel wire rope. .

As shown in Figure 3, the pose detection mechanism 10 includes a base 1, a sleeve 2, and a main shaft 3, the sleeve 2 is vertically arranged and fixed on the base 1, the main shaft 3 is placed in the sleeve 2, the main shaft 3 and the sleeve 2 There is damping between them, the main shaft 3 can be displaced vertically and rotated horizontally relative to the sleeve 2, the side of the sleeve 2 is provided with a slider type displacement sensor 4, and the bottom of the sleeve 2 is provided with an angle sensor 7. When the top plate of the hydraulic support rises or pushes, the wire rope 9 contacts the ring, and under the action of the tension of the wire rope, the rope ring drives the main shaft 3 to undergo linear and angular displacement, and the displacement is passed through the slider displacement sensor 4 and the angle sensor 7 Detect and transmit it to a control terminal such as a computer.

Specifically, the base 1 is composed of a top plate and a hollow cylinder vertically arranged in the center of the top plate, and the end of the hollow cylinder away from the top plate has an external thread. As shown in Figure 9, the side of the sleeve 2 is provided with a vertical sliding groove 2-3, and the outer side of the sleeve 2 is provided with a slider type displacement sensor 4 mounting seat 2-2, and the mounting seat 2-2 is facing the sliding groove The position 2-3 is also provided with a strip groove 2-5, and the bottom of the sleeve 2 is provided with an end cover 2-4 with a central through hole.

As shown in FIG. 4 , an annular boss 3-2 is provided at the center of the axis of the main shaft 3, and a circumferential rolling groove 3-3 is provided along the circumference of the annular boss 3-2. The upper half of the main shaft 3 located on the boss 3-2 is the main shaft without groove end 3-1, the lower half of the main shaft 2 located on the boss 3-2 is the main shaft grooved end 3-4, and the main shaft has the grooved end 3-4 An axial rolling groove 3-5 along the axis of the main shaft is provided.

The top end of the sleeve 2 is sleeved on the hollow cylinder of the base 1, and is fixed with the hollow cylinder through threaded connection. The diameter of the inner hole of the hollow cylinder is slightly larger than the diameter of the main shaft without groove end 3-1, the main shaft without groove end 3-1 passes through the first spring, and its end stretches in the hollow cylinder, the main shaft without groove end 3-1 can be in the hollow The inside of the cylinder slides freely; the main shaft has a grooved end 3-4 passing through the second spring 6, and its end passes through the central through hole of the end cover 2-4, and one end of the second spring contacts the circular boss 3-2 , the other end is in contact with the end cap 2-4 in the sleeve 2, and the rope ring 8 is fixed on the end of the main shaft with a grooved end 3-4, as shown in Figure 3. It should be noted that the component forces of the elastic force of the spring in the horizontal and vertical directions should be smaller than the component forces of the tension force of the steel wire rope in the same direction.

The slider type displacement sensor 4 and the mounting seat 2-2 on the sleeve 2 are fixed through thread cooperation, the slider type displacement sensor 4 includes a miniature slider for sensing linear displacement, and the miniature slider is fixed on the arc surface auxiliary slider 5 On, one end face of the arc surface auxiliary slider 5 is an arc surface 5-1, and the arc surface 5-1 fits with the outer circumference of the annular boss 3-2, and the miniature slider is fixed on the arc surface 5-1. 1 on the opposite end face. As shown in Figure 6, Figure 7, and Figure 8, a square groove 5-2 is provided on the arcuate surface 5-1, and the square groove 5-2 and the circumferential rolling groove 3-3 of the annular boss 3-2 Between them are connected by balls 5-6, and the arc-shaped auxiliary slider 5 can slide circumferentially around the annular boss 3-2.

Specifically, the square groove 5-2 is located at the center of the arc surface 5-1, and the square groove 5-2 of the arc auxiliary slider 5 accommodates two balls 5-6 along the horizontal direction, and the height of the square groove 5-2 is the same as that of the balls. Be clearance fit between 5-6, its height is about the diameter of ball, and the depth of square groove 5-2 is less than the diameter of ball 5-6. The cross-section of the circumferential rolling groove 3-3 of the annular boss 3-2 is a semicircle, and its diameter equals the diameter of the ball 5-6. The slot 5-4, the arc auxiliary slider 5 can slide up and down in the sliding slot 2-3 through the fitting of the I-shaped limiting slot 5-4 with the wall of the sleeve 2 and the mounting seat 2-2. In the initial state, the spring is in a naturally straightened state, the annular boss 3-2 is located at the middle and upper part of the slide groove 2-3, and there is a distance between the groove-free end 3-1 of the main shaft and the top of the base 1 .

The arc auxiliary slider cooperates with the sliding groove 2-3 in the sleeve 2 through its own limit groove 5-4, and can move up and down in the sliding groove 2-3 along the vertical direction; the arc auxiliary slider 5 and The relationship between the main shaft 3: the arc-shaped auxiliary slider 5 is in rolling contact with the circular boss 3-2 in the main shaft 3 through the arc-shaped surface 5-1. The so-called rolling contact means that there is a square groove 5-2 on the arc-shaped surface, and the square groove There are double balls, the diameter of the balls is greater than the depth of the groove, part of the double balls is located in the square groove 5-2, and a part is located in the slideway 3-3 in the boss, that is, the arc surface 5-1 and the boss 3-2 are connected by ball rolling , since the main shaft and the arc-shaped auxiliary slider 5 are connected by balls, when the main shaft 3 rotates, the arc-shaped auxiliary slider 5 keeps its position unchanged due to the limit function of the sliding groove on the sleeve 2, and only the ball moves along The slideway roller on the boss; because the ball is partly located in the slider and partly located in the rolling groove of the boss, when the main shaft 3 moves up and down, the balls in the boss groove drive the slider to move along the direction of the main shaft. That is, the arc auxiliary slider 5 cooperates with the main shaft 3, the two have relative rotation but no relative sliding, and the up and down movement of the main shaft can carry the arc auxiliary slider 5 to move up and down; The slide block 5 is fixedly connected, so that the up and down movement of the main shaft can be transmitted to the slide block type displacement sensor through the arc surface auxiliary slide block 5 and the miniature slide block carried by the sensor.

As shown in Figure 5, the angle sensor 7 includes a circular rotating body 7-2 for sensing the horizontal rotation angle and a fixed body 7-1 as the main body, and the fixed body 7-1 is fixed on the end cover 2-1 of the sleeve 2. 4 outside, the end of the main shaft 3 passes through the annular rotating body 7-2, and the inner side of the annular rotating body 7-2 is provided with a column pin hole 7-5, and the ball 7-3 is constrained to the column by the column pin 7-4 at the same time. In the pin hole 7-5 and the axial rolling groove 3-5, the pin 7-4 is interference fit with the pin hole 7-5, and the cross section of the axial rolling groove 3-5 is circular, and the diameter is equal to that of the ball 7-5. 3 diameters.

The assembly relationship between the annular rotating body 7-2 and the main shaft 3: the annular rotating body 7-2 has its own pin hole, and the pin hole is aligned with the central axis of the axial rolling groove 3-5 at the grooved end of the main shaft , and place the ball 7-3 and the pin 7-4 in the pin hole in turn. Since the diameter of the ball 7-3 is approximately equal to the diameter of the pin hole and the rolling groove, the ball is partly located in the pin hole and partly in the rolling groove. Among them, when the main shaft 3 moves up and down along the axial direction of the sleeve 2, only the balls in the pin holes roll along the axial rolling groove in the main shaft 3, and the rotating body does not move; when the main shaft 3 rotates along the sleeve 2, due to The ball is located in the pin hole and the rolling groove at the same time. The circumferential movement of the main shaft is restricted by the ball in the pin hole. Therefore, the rolling groove on the main shaft drives the ball, and the ball drives the rotating body to rotate, and the rotation angle is transmitted to the fixed position of the angle sensor 7. Body 7-1 part.

It should be noted that the number of axial rolling grooves 3-5 can be multiple, and the multiple axial rolling grooves 3-main shaft 3 are evenly distributed on the circumference, and the annular rotating body 7-2 includes multiple sets of axial rolling grooves 3 -5 matched pin hole 7-5, ball 7-3 and pin 7-4.

work process:

The straightness detection device of the coal mine hydraulic support of the present invention is used to detect the position and posture state of the hydraulic support in coal mine production. The position and attitude detection devices on all supports are connected in series through the rope-through ring on the straightness detection device. One end of the steel wire rope of the pull-wire displacement sensor is fixed at the end of the coal mining face, and the other end is connected to the pull-wire displacement sensor and connected to the pull-wire displacement sensor. Displacement sensors are arranged at the other end of the coal mining face together.

When all the hydraulic supports on the same working surface are at the same horizontal line, since the diameter of the rope-threading ring is larger than the diameter of the wire rope, there is no contact between the wire rope and the rope-threading ring, so the main shaft in the straightness detection device neither moves nor rotates , is in a non-working state.

When some hydraulic supports on the same working surface move, the position of the straightness position detection device fixed on the top beam of the hydraulic support changes accordingly, and the result is the displacement of the rope-piercing ring and the pull-wire type on the straightness detection device. The wire rope of the sensor is in direct contact. Because the main shaft of the rope-threading ring and the straightness detection device is fixedly connected, at the same time, the main shaft in the straightness detection device and the sleeve of the straightness detection device are clearance fit, and the main shaft can rotate freely in the sleeve. Therefore, when the rope ring contacts the wire rope, it will rotate under the elastic force of the wire rope, and then the main shaft will rotate in the sleeve; once the main shaft rotates in the sleeve, the angle sensor at the bottom of the straightness detection device will detect The rotation of the main shaft, and then get the angular displacement equivalent.

The hydraulic support will not only cause the movement of the frame, but also the lifting and lowering of the top beam during the working process, which also needs to be detected. When the top beam of the hydraulic support lifts, the rope ring on the straightness detection device on the top beam will also come into contact with the wire rope, because the fixed position of the wire rope remains unchanged, and the position of the rope ring will change when the top beam is lifted. Lifting, so the wire rope will be in contact with the threading ring. Once the threading ring is in contact with the steel wire rope and with further contact, the threading ring will stop moving under the elastic force of the steel wire rope. In contradiction with this, the top beam keeps the original motion state with the straightness detection device. Due to the gap fit between the main shaft and the sleeve, the rope-threading ring on the main shaft is constrained by the elastic force of the steel wire rope and cannot continue to maintain the original motion state with the top beam, but the mounting seat fixed on the top beam will drive and the top beam mounting seat The sleeve fixed by threaded connection moves with the movement of the top beam. At this time, since the slider type displacement sensor is fixed on the arc-shaped auxiliary slider through threaded connection, at the same time, the arc-shaped auxiliary slider 5 and the arc-shaped protrusion of the main shaft The platform 3-2 can realize the functions of the arc surface auxiliary slider 5 rotating along the main shaft 3 and driving the main shaft 3 to move up and down through the cooperation of the arc surface and the common balls in the groove. When the sleeve moves up and down driven by the top beam of the hydraulic support, the slider-type displacement sensor 4 fixed on the sleeve moves up and down accordingly. Since the position of the main shaft 3 under the elastic force of the wire rope remains unchanged, it is relatively fixed to the position of the main shaft 2. The arc surface auxiliary slider 5 keeps the position unchanged at the same time, and the slider on the slider type displacement sensor 4 fixed on the arc surface auxiliary slider 5 will produce relative to the slider due to the up and down movement of the slider type displacement sensor 4. The sliding of the block displacement sensor generates a displacement signal to detect the up and down movement of the top beam.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (6)

1. a kind of coal mine hydraulic supporting arranges linearity testing apparatus, it is characterised in that：Including pose testing agency and bracing wire Formula displacement transducer, the pose testing agency can detect the displacement of vertical direction and horizontally rotate that the pose is detected Mechanism senses the displacement of vertical direction and horizontally rotates by a wire rope handling ring positioned at bottom；Installed on each hydraulic support Liang Ge poses testing agency, Liang Ge poses testing agency spacing side by side is set, and is fixed on the lower surface of hydraulic support top beam；Institute The main body for stating stay-supported type displacement sensor is fixed on a termination of coal-face, and it exports steel wire rope from stay-supported sensor After main body sequentially passes through the wire rope handling ring of all pose testing agencies being fixed on hydraulic support, the fag end of the steel wire rope is fixed In the other end of coal-face termination；Original state, the center of all wire rope handling rings of steel wire penetrating, and each wire rope handling The vertical steel wire rope of plane where ring.

2. coal mine hydraulic supporting according to claim 1 arranges linearity testing apparatus, it is characterised in that：The pose inspection Surveying mechanism includes base (1), sleeve (2), main shaft (3), and the sleeve (2) is vertically arranged and is fixed on the base (1), institute State main shaft (3) to be placed in the sleeve (2), there is damping between the main shaft (3) and sleeve (2), main shaft (3) being capable of relative set Cylinder and horizontally rotates at (2) vertically displacement, and sleeve (2) side is provided with slide block type displacement transducer (4), the sleeve (2) bottom is provided with angular transducer (7).

3. coal mine hydraulic supporting according to claim 2 arranges linearity testing apparatus, it is characterised in that：The base (1) including taking over a business and being vertically set on central hollow cylinder；The side of the sleeve (2) is provided with vertical sliding groove (2-3), is provided with slide block type displacement transducer (4) mounting seat (2-2) on the outside of the sleeve (2), the mounting seat (2-2) is just right Sliding groove (2-3) position also is provided with bar-shaped trough (2-5), and the bottom of the sleeve (2) is provided with the end cap (2- with center through hole 4)；The axis centre position of the main shaft (3) is provided with round ring boss (3-2), and the round ring boss (3-2) is circumferentially provided with Circumferential rolling groove (3-3)；The main shaft (3) is main shaft slotless end (3- positioned at the top half of the round ring boss (3-2) 1), the main shaft (3) positioned at the lower half of the round ring boss (3-2) for main shaft has groove end (3-4), the main shaft has groove end (3-4) is provided with the axial rolling groove (3-5) along main shaft axial direction；

The top of the sleeve (2) is socketed on the hollow cylinder of the base (1), and the main shaft slotless end (3-1) is through the One spring, its end is stretched into the hollow cylinder, undamped between the hollow cylinder on main shaft slotless end (3-1) and base, institute Stating main shaft has groove end (3-4) through second spring, and its end passes from the center through hole of the end cap (2-4), the wire rope handling ring (8) being fixed on the main shaft has the end of groove end (3-4)；

The slide block type displacement transducer (4) includes the miniature sliding block for sensing straight-line displacement, and the miniature sliding block is fixed on On cambered surface auxiliary slider (5), an end face of the cambered surface auxiliary slider (5) is arcwall face (5-1), the arcwall face (5-1) Excircle with the round ring boss (3-2) is fitted, and the miniature sliding block is fixed on relative another of the arcwall face (5-1) On individual end face, the arcwall face (5-1) is provided with square groove (5-2), the square groove (5-2) and the round ring boss (3- 3) connected by ball (5-6) between circumferential rolling groove (3-3), the cambered surface auxiliary slider (5) can be around the annular Boss (3-3) is circumferentially slided.

4. coal mine hydraulic supporting according to claim 3 arranges linearity testing apparatus, it is characterised in that：The cambered surface is auxiliary Help the square groove (5-2) of sliding block (5) to accommodate two balls (5-6) in the horizontal direction, the height of the square groove (5-2) with it is described For gap coordinates between ball (5-6), the diameter of the depth less than the ball (5-6) of the square groove (5-2), the annulus The cross section of the circumferential rolling groove (3-3) of shape boss (3-3) is semicircle, and its diameter is equal to the diameter of the ball (5-6), institute The both sides for stating cambered surface auxiliary slider (5) are additionally provided with I-shaped stopper slot (5-4), and the cambered surface auxiliary slider (5) is by the work Font stopper slot (5-4) and the sleeve (2) wall and mounting seat (2-2) be adapted to can be in the sliding groove (2-3) on Lower slider.

5. linearity testing apparatus are arranged according to any described coal mine hydraulic supporting of claim 3 or 4, it is characterised in that：Institute Stating angular transducer (7) includes the annular rotary body (7-2) for sensation level rotational angle, and main shaft (3) end is worn The annular rotary body (7-2) is crossed, annular rotary body (7-2) inner side is provided with column pin hole (7-5), and ball (7-3) leads to Pin (7-4) is crossed while being constrained in the column pin hole (7-5) and the axial rolling groove (3-5), the pin (7-4) and institute State column pin hole (7-5) interference fit.

6. coal mine hydraulic supporting according to claim 5 arranges linearity testing apparatus, it is characterised in that：The axially rolling The number of dynamic groove (3-5) is a plurality of, and a plurality of axial rolling groove (3-5) is distributed along the main shaft (3) even circumferential, the circle Ring rotation body (7-2) includes multigroup column pin hole (7-5) coordinated with the axial rolling groove (3-5), ball (7-3) and post Pin (7-4).