CN205013597U - Into quick return motion mechanism is good at to monocycle - Google Patents

Abstract

The utility model relates to a single-cycle work-forward and fast-rewind mechanism, comprising: a driving mechanism and a toggle mechanism connected by a fork lever, the driving mechanism can drive the drive gear to rotate forward and reversely; the toggle mechanism includes a sliding lever , two shift fork rods are arranged on the shift rod, and the two shift fork rods are respectively located outside the two ends of the drive gear; one end of the drive shaft is provided with a screw rod, and the threaded sleeve connected to the soft rope is sleeved on the screw rod; the swing rod is connected through the first rotating shaft The shift rod is connected to the pulley rod through the second rotating shaft, one end of the first spring is fixedly connected to the swing rod between the first rotating shaft and the second rotating shaft, the other end of the first spring is fixedly connected to the fixed block, and the first soft The rope and the second soft rope are respectively connected to the swing rod from the direction of both sides of the swing rod between the first rotating shaft and the second rotating shaft, the first soft rope is directly connected to the swing rod from the nearest side, and the second soft rope passes through the pulley rod At least one pulley on the guide is connected to the swing rod from the other side, and a protrusion is also provided on the driving rod, and the protrusion is connected with the stop mechanism.

Description

A single-cycle work-forward and fast-reverse mechanism

technical field

The utility model relates to a transmission conversion mechanism, in particular to a single-cycle work-forward and fast-back mechanism.

Background technique

The transmission conversion mode of modern power mechanism is mostly carried out by means of frequency converter to control the motor. The frequency converter controls the speed of the motor and controls the steering of the motor, which makes the speed output of the motor to the transmission mechanism extremely flexible. However, the common frequency converter has insufficient voltage compensation for the motor when outputting low frequency, and the torque boost of the motor is not enough, resulting in a decrease in the output torque of the motor and unstable load capacity. Therefore, in the case of low-speed operation and high power requirements, it is still necessary to use a reducer. When the power output by the motor is decelerated by the reducer, the torque can be increased. However, in the case of frequent cut-off of output power and frequent reversing, this type of device can only be realized by frequent start and stop of the motor, and frequent forward and reverse switching. Long-term use is not conducive to the normal operation of the motor. Therefore, it is necessary to design a set of mechanical transmission mechanism to realize the functions of frequent reversing and frequent cut-off of the output power under the condition of continuous and stable operation of the motor and reducer.

Contents of the invention

The utility model overcomes the deficiencies of the prior art, and provides a cycle driving mechanism assisted by a spring swing rod and constrained by a soft rope.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a single-cycle work-forward and fast-reverse mechanism, including: a driving mechanism and a toggle mechanism connected by a fork lever, which is characterized in that,

- the drive mechanism can drive the drive gear to rotate forward and reverse;

- the toggling mechanism includes a sliding lever, on which two fork levers are arranged, and the two fork levers are respectively located outside the two ends of the driving gear;

One end of the drive shaft is provided with a screw rod, and the threaded sleeve connected to the soft rope is sleeved on the screw rod; the swing rod is connected to the driving rod through the first rotating shaft, and the swing rod is connected to the pulley rod through the second rotating shaft, and one end of the first spring is fixed Connected to the swing link between the first rotating shaft and the second rotating shaft, the other end of the first spring is fixedly connected to the fixed block, and the first soft rope and the second soft rope swing from the first rotating shaft and the second rotating shaft respectively. The direction on both sides of the rod is connected to the swing rod, the first soft rope is directly connected to the swing rod from the nearest side, and the second soft rope is guided by at least one pulley on the pulley rod to connect to the swing rod from the other side;

A bump is also provided on the shift lever, and the bump is engaged with the stop mechanism.

In a preferred embodiment of the present invention,

- when the driving gear meshes with the first gear, the swing bar is biased towards the first gear, and the first spring is located on one side of the swing bar's offset direction;

- When the driving gear meshes with the second gear, the swing bar is biased toward the second gear, and the first spring is located at one side of the swing bar's biasing direction.

In a preferred embodiment of the present invention, the screw sleeve is close to the side of the second gear, the screw sleeve is connected to a bent rod, and the free end of the bent rod is connected to the soft rope.

In a preferred embodiment of the present invention,

- when the driving gear meshes with the first gear, the screw drives the screw sleeve away from the driving gear, and the first flexible rope is in a taut state prior to the second flexible rope;

- When the driving gear meshes with the second gear, the screw drives the screw sleeve close to the driving gear, and the second flexible rope is in a tensioned state prior to the first flexible rope.

In a preferred embodiment of the present invention, the two ends of the driving rod are respectively slidably socketed on the corresponding sleeves.

In a preferred embodiment of the present invention, the stop mechanism includes a stop rod with a wedge-shaped head at one end and a fixed plate, the fixed plate is connected with a sleeve block, and the wedge-shaped head of the stop rod extends out of the fixed One side of the plate, the other end of the stop rod is sleeved with a second spring protruding from the other side of the fixed plate, and the two ends of the second spring are respectively fixed on the fixed plate and the stop rod. The head includes a wedge-shaped face and a rectangular face.

In a preferred embodiment of the present invention, a handle is provided at the end of the stop rod on the stop mechanism.

In a preferred embodiment of the utility model, a stopper is provided on both sides of the free end of the swing rod.

In a preferred embodiment of the present invention, the driving gear sliding key is arranged on the driving shaft, and the moving distance of the driving gear on the sliding key of the driving shaft is the distance between the first gear and the second gear axial distance.

In a preferred embodiment of the present invention, the driving mechanism includes a first gear and a second gear that can respectively mesh with the driving gear, the driving gear is slidably arranged on the driving shaft, the first gear and the second gear The two gears rotate in opposite directions; the first gear is coaxially connected with a transmission gear, and the transmission gear meshes with the second gear.

In a preferred embodiment of the present invention, the distance between the two shift fork rods is greater than the axial length of the driving gear.

In a preferred embodiment of the present invention, the first spring is in a stretched state.

The utility model solves the defects in the background technology, and the utility model has the following beneficial effects:

(1) Through the action of the toggle mechanism, the position of the driving gear can be changed between the first gear and the second gear, which plays the role of changing the meshing object of the driving gear. At the same time, because the first gear and the second gear rotate in opposite directions, Ensure that the drive shaft changes direction of rotation each time the drive gear changes meshing objects.

(2) The rotation direction of the drive shaft and the toggle direction of the toggle mechanism just form a linkage structure. When the drive gear meshes with the first gear, the toggle mechanism is driven by the drive shaft so that the toggle mechanism has the ability to turn the drive gear to the second gear. The tendency and power of the gear, and finally the driving gear is separated from the first gear, and driven by the elastic potential energy of the first spring on the swing rod to mesh with the second gear; otherwise, when the driving gear meshes with the second gear, the toggle mechanism will make the driving gear reverse movement.

(3) On the one hand, the structure of the feather key can ensure that there is a clamp limit between the drive gear and the drive shaft along the circumference of the drive shaft, so that the drive gear will not move relative to the drive shaft along the circumference; on the other hand, the drive gear can Sliding along the axial direction of the drive shaft ensures that the drive gear moves between the first gear and the second gear.

(4) The two fork levers are respectively located on both sides of the drive gear, and the drive gear can move axially along the drive shaft under the drive of the lever.

(5) The set block can limit the movement posture of the lever, and at the same time, the stopper can limit the swing lever driven by the first spring within a certain swing range, and then the movement range of the lever is also limited to ensure that the lever will not be excessive The left and right offsets only ensure the distance between the first gear and the second gear for the drive gear to change mesh.

(6) When the driving gear meshes with the first gear, the pendulum shifts toward the side of the first gear. At this time, the first spring tightens the pendulum, and the screw sleeve is driven away from the first gear by the screw rod, and then the first soft rope is first Tighten it, and then pull the pendulum to rotate towards the second gear. When the pendulum is over the vertical state, the driving gear will be separated from the first gear. At this time, the tension of the first spring will move the pendulum towards the second gear. Pull and swing the lever towards the second gear, and finally press the drive gear to mesh with the second gear.

(7) During the left and right movement of the fork lever, the two fork levers continuously push the drive gear to move left and right along the drive shaft to change the meshing objects.

(8) The mutual cooperation between the first rotating shaft and the second rotating shaft enables the pendulum to rotate with the second rotating shaft as the center of a circle, drives the shift lever to move left and right, and then drives the shift fork lever to follow the shift rod to move left and right.

(9) Two pulleys are set on the left and right sides of the second rotating shaft. After the second soft rope bypasses the two pulleys, the changed second soft rope pulls the direction of the pendulum to ensure that the two soft ropes can move from different directions. Pull the lever.

(10) During the left and right movement of the bending rod, the first soft rope and the second soft rope can achieve an asynchronous preferential tightening state, so that the pendulum can only be tightened by one soft rope at the same time.

(11) The setting of the stopper ensures that the lower end of the swing rod will not deviate beyond the range, that is, the swing rod will not make the moving range of the lever too large.

(12) The structure of the screw driving the screw sleeve, and then the screw sleeve provides the power source for the toggle mechanism. Since the rotation direction of the screw is related to the meshing object of the drive gear, the movement direction of the screw sleeve is related to the rotation direction of the drive shaft, and The direction of rotation of the drive shaft is controlled by the toggle mechanism; thus, the above-mentioned process forms a cyclic motion process that influences each other, and the toggle mechanism and the drive mechanism continuously affect the continuous cycle control.

(13) When the driving gear meshes with the first gear, the reel close to the second gear will tighten its corresponding soft rope. When the soft rope is stretched to a certain degree, the soft rope will pull the pendulum. At this time, the fork lever on the shift lever moves, and the fork lever pushes the driving gear to the direction of the second gear, and finally makes the driving gear mesh with the second gear, so that the driving shaft reverses; otherwise, the driving gear is pushed to the first gear. gear direction and mesh.

(14) The distance between the two shift fork rods is greater than the axial length of the drive gear, which can provide inertial buffering for the reverse movement of the drive gear.

(15) The distance between the two shift fork rods is greater than the axial length of the drive gear, and the length longer than the drive gear is the margin of the distance between the two shift fork rods relative to the length of the drive gear. Due to the existence of the above margin, the swing rod in When in the vertical state, the two shift fork rods will not be blocked by the drive gear, and the swing rod only needs to rely on inertia when it crosses its vertical state.

(16) The transmission gear is coaxial with the first gear, and the second gear meshes with the transmission gear to realize the reverse rotation of the first gear and the second gear.

(17) The handle can pull up the stop rod on the stop mechanism, so that the bump blocked by the right-angled surface on the stop mechanism can be released from the restraint, and the lever can continue to move left and right. As long as the mechanism is not pulled up, it can only do single Periodic movement.

(18) The position of the stop mechanism can block the protrusion at the position where the drive gear is just between the first gear and the second gear, and the drive gear is disengaged at this time.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is the three-dimensional structure diagram of the preferred embodiment of the present utility model;

Fig. 2 is the three-dimensional structure diagram of the preferred embodiment of the present utility model;

Fig. 3 is a three-dimensional structure diagram of the stop mechanism of the present utility model;

In the figure: 1, the first gear, 2, the second gear, 3, the driving gear, 4, the driving shaft, 5, the feather key, 6, the transmission gear, 7, the driving lever, 8, the fork lever, 9, the cover block , 10, screw rod, 11, screw sleeve, 12, bent rod, 13, swing rod, 15, first rotating shaft, 16, second rotating shaft, 17, fixed block, 18, pulley rod, 19, pulley, 20, first Spring, 21, block, 22, the first soft rope, 23, the second soft rope, 24, bump, 25, stop mechanism, 26, stop lever, 27, second spring, 28, wedge-shaped head, 29, wedge-shaped Face, 30, rectangular face, 31, handle, 32, fixed plate, 33, bolt locking device.

detailed description

The utility model is described in further detail now in conjunction with accompanying drawing and embodiment, and these accompanying drawings all are simplified schematic diagrams, only illustrate the basic structure of the utility model in schematic mode, so it only shows the formation relevant to the utility model.

As shown in Figure 1, Figure 2 and Figure 3, a single-cycle work-forward and fast-reverse mechanism includes: a driving mechanism and a toggle mechanism connected by a fork lever 8,

The drive mechanism includes a drive gear 3 that can mesh with the first gear 1 and the second gear 2 respectively, the drive gear 3 is slidably arranged on the drive shaft 4, and the rotation direction of the first gear 1 and the second gear 2 is opposite; The action can change the position of the driving gear 3 between the first gear 1 and the second gear 2, which plays the role of changing the meshing object of the driving gear 3. At the same time, because the first gear 1 and the second gear 2 rotate in opposite directions, it is guaranteed that each After the secondary driving gear 3 changes the meshing object, the driving shaft 4 all changes the direction of rotation.

The toggling mechanism includes a sliding lever 7, on which two fork levers 8 are arranged. Axis 4 moves axially.

One end of the drive shaft 4 is provided with a screw rod 10, and the threaded sleeve 11 connected to the soft rope 14 is threaded on the screw rod 10; The direction of rotation is related to the meshing object of the drive gear 3, so the direction of motion of the screw sleeve 11 is related to the direction of rotation of the drive shaft 4, and the direction of rotation of the drive shaft 4 is controlled by the toggle mechanism; During the cycle movement process, the toggle mechanism and the drive mechanism continuously affect the continuous cycle control.

The fork 13 is connected to the shift lever 7 through the first rotating shaft 15, the fork 13 is connected to the pulley lever 18 through the second rotating shaft 16, and one end of the first spring 20 is fixedly connected to the fork 13 between the first rotating shaft 15 and the second rotating shaft 16. The other end of the first spring 20 is fixedly connected to the fixed block 17 . The mutual cooperation of the first rotating shaft 15 and the second rotating shaft 16 enables the swing lever 13 to rotate with the second rotating shaft 16 as the center of a circle, driving the driving rod 7 to move left and right, and then driving the shift fork rod 8 to follow the driving rod 7 to move left and right.

The first flexible rope 22 and the second flexible rope 23 are respectively connected to the swing lever 13 from the direction on both sides of the swing lever 13 between the first rotating shaft 15 and the second rotating shaft 16, and the first flexible rope 22 is directly connected from the nearest side. Fork 13, the second soft rope 23 is guided by at least one pulley 19 on the pulley bar 18 and connected with fork 13 from the other side. Two pulleys 19 are arranged on the left and right sides of the second rotating shaft 16. After the second soft rope 23 bypasses the two pulleys 19, the transformed second soft rope 23 pulls the direction of the pendulum 13 to ensure that the two soft ropes 14 can be moved separately. Pull the swing lever 13 from different directions. During the left and right movement of the curved rod 12, the first flexible rope 22 and the second flexible rope 23 can achieve an asynchronous priority tension state, so that the swing rod 13 can only be tightened by one flexible rope 14 at the same time. .

The rotation direction of the drive shaft 4 and the toggle direction of the toggle mechanism just form a linkage structure. When the drive gear 3 meshes with the first gear 1, the toggle mechanism is driven by the drive shaft 4 so that the toggle mechanism has the ability to turn the drive gear 3 to The inclination and power of the second gear 2, and finally the driving gear 3 breaks away from the first gear 1, and is driven by the elastic potential energy of the first spring 20 on the fork 13 to mesh with the second gear 2; otherwise, the driving gear 3 and the second gear 2 When engaged, the toggle mechanism will cause the drive gear 3 to move in reverse.

During the left and right movement of the shift lever 7, the shift fork lever 8 continuously pushes the drive gear 3 to move left and right along the drive shaft 4 through the two shift fork levers 8 to change the meshing object.

When the driving gear 3 meshes with the first gear 1, the swing lever 13 is biased towards the direction of the first gear 1, and the first spring 20 is located on one side of the offset direction of the swing lever 13; when the driving gear 3 is meshed with the second gear 2, the swing lever 13 is biased toward In the direction of the second gear 2 , the first spring 20 is located on one side of the shifting direction of the swing rod 13 . When the driving gear 3 is meshed with the first gear 1, the swing rod 13 is shifted toward the first gear 1 side, at this moment, the first spring 20 tightens the swing rod 13, and the screw sleeve 11 is driven away from the first gear 1 by the screw rod 10, and then The first soft rope 22 is first tightened, and then the swing lever 13 is pulled to rotate towards the second gear 2. When the swing lever 13 crosses the vertical state, the drive gear 3 is disengaged from the first gear 1. At this time, the first spring 20 The pulling force will pull the swing bar 13 towards the second gear 2, swing the swing bar 13 towards the second gear 2, and finally press the driving gear 3 to mesh with the second gear 2.

The first spring 20 is in tension.

The screw sleeve 11 is close to the side of the second gear 2 , the screw sleeve 11 is connected to the bent rod 12 , and the free end of the bent rod 12 is connected to the soft rope 14 .

When the driving gear 3 meshes with the first gear 1, the screw 10 drives the screw sleeve 11 away from the driving gear 3, and the first soft rope 22 is in a tight state before the second soft rope 23; when the driving gear 3 meshes with the second gear 2, The screw rod 10 drives the screw sleeve 11 to approach the driving gear 3 , and the second flexible rope 23 is in a taut state prior to the first flexible rope 22 . When the drive gear 3 meshes with the first gear 1, the reel close to the second gear 2 will tighten its corresponding soft rope 14, and when the soft rope 14 is stretched to a certain degree, the soft rope 14 will swing When the lever 13 is pulled, the fork lever 8 on the shift lever 7 also moves, and the fork lever 8 pushes the driving gear 3 to the direction of the second gear 2, and finally makes the driving gear 3 mesh with the second gear 2, so that the driving Shaft 4 reverses; conversely, drive gear 3 is pushed to the direction of first gear 1 and engages.

The distance between the two shift fork rods 8 is greater than the axial length of the drive gear 3 , which can provide inertial buffering for the reverse movement of the drive gear 3 . The distance between the two shift fork rods 8 is greater than the axial length of the drive gear 3, and the length longer than the drive gear 3 is the margin of the distance between the two shift fork rods 8 relative to the length of the drive gear 3. Due to the existence of the above margin, the pendulum When the bar 13 is in the vertical state, the two fork rods 8 will not be blocked by the drive gear 3, and the fork 13 only needs to rely on inertia when it crosses its vertical state.

Fork 13 free ends both sides are respectively provided with a stopper 21, and the setting of stopper 21 guarantees that the lower end of fork 13 can not deviate beyond the range, that is fork 13 can not make driving lever 7 move too much.

The two ends of the driving rod 7 are respectively slidably socketed on the respective corresponding sets of blocks 9, the sets of blocks 9 can limit the movement posture of the driving rod 7, and at the same time, the stopper 21 can limit the swing rod 13 driven by the first spring 20 to a certain swing. Within the range, and then the range of movement of the driving rod 7 is also limited, so as to ensure that the driving rod 7 will not deviate excessively left and right, and only ensure that the driving gear 3 changes the meshing distance between the first gear 1 and the second gear 2.

The drive gear 3 feather key 5 is arranged on the drive shaft 4, and the moving distance of the drive gear 3 on the feather key 5 of the drive shaft 4 is the axial distance between the first gear 1 and the second gear 2. The structure of the feather key 5 on the one hand It can ensure that there is a clamp limit along the circumference of the drive shaft 4 between the drive gear 3 and the drive shaft 4, and ensure that the drive gear 3 will not move relative to the drive shaft 4 along the circumference. On the other hand, the drive gear 3 can move along the drive shaft 4. 4 to ensure that the drive gear 3 moves between the first gear 1 and the second gear 2.

The first gear 1 is coaxially connected to the transmission gear 6, the transmission gear 6 meshes with the second gear 2, the transmission gear 6 is coaxial with the first gear 1, and the second gear 2 meshes with the transmission gear 6, realizing the first gear 1 and the second gear The reverse rotation of the second gear 2.

The end of stop bar 26 on stop mechanism 25 is provided with handle, and handle 31 can pull up stop bar 26 on stop mechanism 25, and the projection 24 that is blocked by right-angled surface 30 on stop mechanism 25 can break away from restraint like this, and driving lever 7 just can continue to move left and right, as long as do not pull up this mechanism just can only do single cycle motion. The position of the stop mechanism 25 can block the protrusion 24 at the position where the driving gear 3 is just between the first gear 1 and the second gear 2 , and the driving gear 3 is disengaged at this moment.

Stop mechanism 25 comprises a stop bar 26 and a fixed plate 32 that one end has wedge-shaped head 28, and fixed plate 32 is connected with a sleeve block 9, and the wedge-shaped head 28 of stop bar 26 stretches out fixed plate 32 one face outsides, and stop bar 26 is other One end of the second spring 27 protrudes from the other side of the fixing plate 32. The two ends of the second spring 27 are fixed on the fixing plate 32 and the stop bar 26 respectively.

As shown in Figure 1, the projection 24 can only cross the wedge-shaped surface 29 on the stop mechanism 25 from the left side of the stop mechanism 25 to the right side of the stop mechanism 25, but the projection 24 cannot cross the stop mechanism from the right side of the stop mechanism 25. The right-angled surface 30 on 25 reaches the left side of the stop mechanism 25 .

The curved rod 12 is provided with a bolt locking device 33 at its corner, and the part of the curved rod 12 parallel to the drive shaft 4 can be inserted into the inner hole of the bolt locking device 33 and slide in the inner hole. The bolt locking device 33 The bolts on the top are screwed in and screwed out to control the tightness; by adjusting the relative position of the bent rod 12 and the bolt locking device 33, the position adjustment of the bent rod 12 to the shift fork rod 8 can be realized, so as to adjust the shifting of the shift fork rod 8 to the driving gear. timing.

The driving rod 7 can only move along the axial direction of the driving rod 7 itself under the restriction of the cover block 9, but the driving rod 7 cannot rotate along the axial direction of the driving rod itself in the cover block 9, so that the movement on the driving rod 7 is ensured. The shift fork lever 8 can not turn to, and it has also ensured that the shift fork lever 8 can be moved to the drive gear 3 on its motion track.

The above is inspired by the ideal embodiment of the utility model, and through the above description, relevant personnel can make various changes and modifications within the scope of not deviating from the technical idea of the utility model. The technical scope of this utility model is not limited to the content in the description, but must be determined according to the scope of the claims.

Claims (10)

1. work enters a quick return motion mechanism monocycle, comprising: the driving mechanism be connected by shifting fork bar and toggle mechanism, be is characterized in that,

-described driving mechanism comprises the first gear and the second gear, and described driving mechanism can drive actuation gear to rotate and reverse;

-described toggle mechanism comprises the driving lever sliding and arrange, and described driving lever is arranged two shifting fork bars, two shifting fork bars lay respectively at outside the two ends of actuation gear;

Described live axle one end is provided with screw rod, and the swivel nut thread bush connecting tightrope is connected on described screw rod; Fork connects driving lever by the first rotating shaft, fork connects roller arm by the second rotating shaft, one end of first spring is fixedly connected on the fork between the first rotating shaft and the second rotating shaft, the first spring the other end is fixedly connected on fixed block, first tightrope and the second tightrope connect fork from the direction of the fork both sides between the first rotating shaft and the second rotating shaft respectively, first tightrope directly connects fork from side nearby, and the second tightrope is guided by least one pulley on roller arm and connects fork from opposite side;

Described driving lever is also provided with projection, and described projection is connected with shut-down mechanism.

2. a kind of monocycle work according to claim 1 enters quick return motion mechanism, it is characterized in that:

When-described actuation gear and described first gears meshing, the described first gear direction of described fork deflection, described first spring is positioned at side, described fork offset direction;

When-described actuation gear and described second gears meshing, the described second gear direction of described fork deflection, described first spring is positioned at side, described fork offset direction.

3. a kind of monocycle work according to claim 2 enters quick return motion mechanism, it is characterized in that: described swivel nut is near described second gear side, and described swivel nut connects knee, and described knee free end connects described tightrope.

4. a kind of monocycle work according to Claims 2 or 3 enters quick return motion mechanism, it is characterized in that:

When-described actuation gear and described first gears meshing, described in described bolt rod driving, swivel nut is away from described actuation gear, and described first tightrope is in tensioned state prior to described second tightrope;

When-described actuation gear and described second gears meshing, described in described bolt rod driving, swivel nut is near described actuation gear, and described second tightrope is in tensioned state prior to described first tightrope.

5. a kind of monocycle work according to claim 1 enters quick return motion mechanism, it is characterized in that: described driving lever two ends are slidably socketed respectively on each self-corresponding cover block.

6. a kind of monocycle work according to claim 5 enters quick return motion mechanism, it is characterized in that: described shut-down mechanism comprises one end with the locking lever of sphenocephaly and a fixed plate, described fixed plate overlaps block be connected with one, the sphenocephaly of described locking lever stretches out outside described fixed plate face, outside another face of stretching out described fixed plate of sheathed second spring of the described locking lever the other end, described second both ends of the spring is separately fixed at described fixed plate and locking lever, and described sphenocephaly comprises a sphenoid surface and a right-angle surface.

7. a kind of monocycle work according to claim 6 enters quick return motion mechanism, it is characterized in that: on described shut-down mechanism, the end of locking lever is provided with handle.

8. a kind of monocycle work according to claim 1 enters quick return motion mechanism, it is characterized in that: described fork free end both sides are respectively provided with a block.

9. a kind of monocycle work according to claim 1 enters quick return motion mechanism, it is characterized in that: described actuation gear feather key is arranged on described live axle, described actuation gear displacement distance on the feather key of live axle be namely described first gear and described second gear shaft to distance.

10. a kind of monocycle work according to claim 1 enters quick return motion mechanism, it is characterized in that: described driving mechanism comprises first gear and the second gear that can engage with actuation gear respectively, described actuation gear is slidably arranged on live axle, and described first gear is contrary with described second gear sense of rotation;

Described first gear coaxial connection for transmission gear, described driving gear and described second gears meshing.