阅读说明：本技术 一种旋转限位装置及其使用方法 (Rotation limiting device and using method thereof ) 是由 梁伟 黄浩 董新营 于 2021-08-16 设计创作，主要内容包括：一种旋转限位装置及其使用方法,包括旋转限位转盘和活塞缸。所述旋转限位转盘为圆盘结构,所述旋转限位转盘与旋转轴同轴固定连接,所述旋转限位转盘的外圆周上均匀开设有多个限位孔,所述活塞缸通过其内部设置的可伸缩的活塞杆与限位孔插入配合,所述密封板将活塞缸分隔为油腔和弹簧腔,所述油腔通过其侧部设置的三位三通阀与压力油源相连通,所述弹簧腔内设置有弹簧,所述弹簧的顶端与密封板压紧配合,所述弹簧的底端与活塞缸压紧配合。本设计不仅可以通过弹簧的弹力驱动活塞杆对限位孔进行限位,不需要系统持续做功,有效提高经济性和环保性,而且可以通过三位三通阀的阀位控制限位装置工作,控制系统结构简单可靠。(A rotary limiting device and a using method thereof comprise a rotary limiting turntable and a piston cylinder. The rotary limiting turntable is of a disc structure and is fixedly connected with the rotating shaft in a coaxial mode, a plurality of limiting holes are evenly formed in the outer circumference of the rotary limiting turntable, the piston cylinder is matched with the limiting holes in an inserting mode through a telescopic piston rod arranged inside the piston cylinder, the piston cylinder is separated into an oil cavity and a spring cavity through a sealing plate, the oil cavity is communicated with a pressure oil source through a three-position three-way valve arranged on the side portion of the oil cavity, a spring is arranged in the spring cavity, the top end of the spring is in compression fit with the sealing plate, and the bottom end of the spring is in compression fit with the piston cylinder. The design can not only limit the limiting hole by driving the piston rod through the elastic force of the spring, and does not need the system to continuously do work, thereby effectively improving the economy and the environmental protection, but also can control the limiting device to work through the valve position of the three-position three-way valve, and the control system has simple and reliable structure.)

1. The utility model provides a rotatory stop device which characterized in that:

the rotation limiting device comprises: a rotary limiting turntable (1) and a piston cylinder (2); the rotary limiting turntable (1) is of a disc structure, the rotary limiting turntable (1) is fixedly connected with a rotating shaft (14) of equipment to be limited, the rotary limiting turntable (1) and the rotating shaft (14) are coaxially arranged, and a plurality of limiting holes (13) are uniformly formed in the outer circumference of the rotary limiting turntable (1); a telescopic piston rod (21) is arranged in the piston cylinder (2), the piston rod (21) is arranged right below the rotary limiting turntable (1), the piston rod (21) is inserted and matched with the limit hole (13) after passing through the top plate of the piston cylinder (2), the piston rod (21) is in sliding fit with the side wall of the piston cylinder (2) through a sealing plate (22) arranged in the middle of the piston rod, the sealing plate (22) is in sealing fit with the side wall of the piston cylinder (2), the piston cylinder (2) is divided into an oil cavity (24) and a spring cavity (30) by the sealing plate (22), the oil chamber (24) is communicated with a pressure oil source through a three-position three-way valve (25) arranged on the side part of the oil chamber, a spring (23) is arranged in the spring cavity (30), the spring (23) is in compression fit with the sealing plate (22), and the bottom of the spring (23) is in compression fit with the piston cylinder (2).

2. A rotation limiting device as defined in claim 1, further comprising:

the oil cavity (24) is arranged above the sealing plate (22), the spring cavity (30) is arranged below the sealing plate (22), the top of the spring (23) is in compression fit with the bottom of the sealing plate (22), and the bottom of the spring (23) is in compression fit with the top of the sealing plate (22).

3. A rotation limiting device as defined in claim 2, wherein:

the piston rod (21) is provided with a limiting block (26), the limiting block (26) is arranged above a bottom plate of the piston cylinder (2), the limiting block (26) is in limiting fit with the bottom plate of the piston cylinder (2), and the piston rod (21) is in sliding fit with the bottom plate of the piston cylinder (2).

4. A rotation limiting device as claimed in any one of claims 1, 2 or 3, wherein:

an oil inlet (27) of the three-position three-way valve (25) is communicated with a pressure oil source, an oil outlet (28) of the three-position three-way valve (25) is communicated with an oil cavity (24), and an oil return port (29) of the three-position three-way valve (25) is communicated with a normal-pressure oil pool.

5. A rotation limiting device according to claim 4, wherein:

the top of piston rod (21) is provided with guide structure (31), guide structure (31) are frustum structure, guide structure (31) top diameter is 90% of bottom diameter, spacing hole (13) be with guide structure (31) assorted taper hole.

6. A rotation limiting device according to claim 5, wherein:

the rotary limiting turntable is characterized in that the rotary limiting turntable (1) is fixedly connected with a rotary shaft (14) through a round hole (11) formed in the circle center of the rotary limiting turntable, at least two positioning wedges (12) are uniformly arranged at the edge of the round hole (11), at least two positioning grooves (15) are uniformly formed in the end portion of the rotary shaft (14), the positioning grooves (15) and the positioning wedges (12) are correspondingly arranged, and the rotary limiting turntable (1) is fixedly connected with the positioning grooves (15) formed in the rotary shaft (14) through the positioning wedges (12) arranged on the rotary limiting turntable.

7. A rotation limiting device as defined in claim 6, wherein:

the number of the positioning wedges (12) is three.

8. A method of using the rotation limiting device according to any one of claims 1 to 7, characterized in that:

the using method comprises the following steps:

the first step is as follows: the method comprises the steps that an operator opens a main switch of a rotary limiting device and a main switch of equipment to be limited, the rotary limiting device and the equipment to be limited start to work, the operator operates a controller to send a control signal to drive a three-position three-way valve (25) to start to work after the rotary limiting device starts to work, a valve core of the three-position three-way valve (25) moves, an oil inlet (27) is communicated with an oil outlet (28) after the valve core of the three-position three-way valve (25) moves, hydraulic oil enters an oil cavity (24), the hydraulic oil pushes a piston rod (21) to move against the elastic force of a spring (23) after entering the oil cavity (24), the top of the piston rod (21) is separated from a limiting hole (13), a rotating shaft (14) of the equipment to be limited starts to rotate after the top of the piston rod (21) is separated from the limiting hole (13), and the preparation step is completed at the moment;

the second step is that: a limiting step, after the equipment needing limiting rotates to a position, a controller sends a signal to drive a three-position three-way valve (25) to start working, a valve core of the three-position three-way valve (25) moves to close an oil inlet (27) and simultaneously communicate an oil outlet (28) and an oil return port (29), after the oil outlet (28) and the oil return port (29) are communicated, an oil cavity (24) is communicated with a normal-pressure oil pool, a piston rod (21) is pushed by the elasticity of a spring (23) to be inserted into a limiting hole (13), and at the moment, the limiting step is completed;

the third step: a maintaining step, when the equipment needing to be limited needs to be continuously maintained for limiting, the controller sends a control signal to drive a three-position three-way valve (25) to start working, a valve core of the three-position three-way valve (25) moves, an oil outlet (28) is closed after the valve core of the three-position three-way valve (25) moves, an oil cavity (24) is in a sealed state after the oil outlet (28) is closed, and the maintaining step is finished at the moment;

the fourth step: and a separation step, when the equipment needing to be limited needs to rotate again, the controller sends a control signal to drive the three-position three-way valve (25) to start working, a valve core of the three-position three-way valve (25) moves, after the valve core of the three-position three-way valve (25) moves, the oil inlet (27) is communicated with the oil outlet (28), hydraulic oil enters the oil cavity (24), the hydraulic oil pushes the piston rod (21) to move by overcoming the elastic force of the spring (23) after entering the oil cavity (24), meanwhile, the top of the piston rod (21) is separated from the limiting hole (13), after the top of the piston rod (21) is separated from the limiting hole (13), the rotating shaft (14) needing to be limited starts to rotate, and the separation step is completed at this moment.

Technical Field

The invention relates to a rotation limiting device, in particular to a rotation limiting device and a using method thereof, which are particularly suitable for a rotation limiting device driven by hydraulic pressure.

Background

The rotary machine in the position servo control mechanism needs to be accurately stopped at a fixed position without being influenced by load and external factors after reaching a target position, the conventional rotary machine usually cannot keep a determined position after losing power, and the rotary machine is easy to rotate under the influence of the load and the external factors to cause position change. The limit of the rotating machinery in the current position servo control mechanism is generally carried out by three modes of continuously giving power to the rotating machinery, a mechanical brake or an electromagnetic band-type brake;

the mechanical brake used at present comprises a brake arm, a brake body, a brake wheel and a push rod, wherein the brake wheel is coaxially fixed with a rotating shaft of a rotating machine; the electromagnetic band-type brake used at present comprises an electromagnet, a pawl, a ratchet wheel and a spring, wherein the ratchet wheel is coaxially fixed with a rotating shaft of a rotating machine, the pawl is clamped on the ratchet wheel through the spring, the electromagnet is arranged on one side of the pawl, the pawl is attracted by the magnetic force of the electromagnet when the electromagnet is electrified so as to be separated from the ratchet wheel, the pawl is firmly clamped with the ratchet wheel under the pulling force of the spring when the electromagnet is powered off, and the rotating machine is prevented from rotating to cause position change.

Although the three modes can meet the limit requirements of the position servo control mechanism, the three modes still have the following defects:

1. the rotary machine continuously gives power, the energy consumption is large, the environmental protection performance is poor, the loss of the equipment is increased, and the service life of the equipment is shortened.

2. The mechanical brake or the electromagnetic band-type brake has a complex structure and higher cost.

3. The braking body and the braking wheel friction limit adopted by the mechanical brake and the pawl and ratchet wheel clamping limit adopted by the electromagnetic band-type brake can cause the braking structure to be abraded due to friction or collision, the braking structure needs to be replaced regularly, and the maintenance cost is increased.

Disclosure of Invention

The invention aims to overcome the defects of high energy consumption and poor environmental protection in the prior art, and provides a rotary limiting device which does not need to continuously supply power, and has a simple structure and low cost.

In order to achieve the above purpose, the technical solution of the invention is as follows:

a rotation-limiting device, comprising: the limiting rotary table and the piston cylinder are rotated; the rotary limiting turntable is of a disc structure and is fixedly connected with a rotating shaft of equipment needing limiting, the rotary limiting turntable and the rotating shaft are coaxially arranged, and a plurality of limiting holes are uniformly formed in the outer circumference of the rotary limiting turntable; the piston cylinder is internally provided with a telescopic piston rod, the piston rod is arranged under the rotary limiting turntable, the piston rod is inserted and matched with the limiting hole after passing through a top plate of the piston cylinder, the piston rod is in sliding fit with the side wall of the piston cylinder through a sealing plate arranged at the middle of the piston rod, the sealing plate is in sealing fit with the side wall of the piston cylinder, the sealing plate divides the piston cylinder into an oil cavity and a spring cavity, the oil cavity is communicated with a pressure oil source through a three-position three-way valve arranged at the side part of the oil cavity, a spring is arranged in the spring cavity, the spring is in compression fit with the sealing plate, and the bottom of the spring is in compression fit with the piston cylinder.

The oil cavity is arranged above the sealing plate, the spring cavity is arranged below the sealing plate, the top of the spring is in compression fit with the bottom of the sealing plate, and the bottom of the spring is in compression fit with the top of the sealing plate.

The piston rod is provided with a limiting block, the limiting block is arranged above a bottom plate of the piston cylinder, the limiting block is in limiting fit with the bottom plate of the piston cylinder, and the piston rod is in sliding fit with the bottom plate of the piston cylinder.

The oil inlet of the three-position three-way valve is communicated with a pressure oil source, the oil outlet of the three-position three-way valve is communicated with an oil cavity, and the oil return port of the three-position three-way valve is communicated with a normal-pressure oil pool.

The top of piston rod is provided with guide structure, guide structure is the frustum structure, guide structure top diameter is 90% of bottom diameter, spacing hole be with guide structure assorted taper hole.

The rotary limiting turntable is fixedly connected with the rotary shaft through a round hole formed in the circle center of the rotary limiting turntable, at least two positioning wedges are uniformly arranged on the edge of the round hole, at least two positioning grooves are uniformly formed in the end portion of the rotary shaft, the positioning grooves and the positioning wedges are correspondingly arranged, and the rotary limiting turntable is fixedly connected with the positioning grooves formed in the rotary shaft through the positioning wedges arranged on the rotary limiting turntable.

The number of the positioning wedges is three.

A use method of a rotation limiting device comprises the following steps:

the first step is as follows: the method comprises the steps that an operator opens a main switch of a rotary limiting device and a main switch of equipment to be limited, the rotary limiting device and the equipment to be limited start to work, after the rotary limiting device starts to work, the operator operates a controller to send a control signal to drive a three-position three-way valve to start to work, a valve core of the three-position three-way valve moves, after the valve core of the three-position three-way valve moves, an oil inlet is communicated with an oil outlet, hydraulic oil enters an oil cavity, after the hydraulic oil enters the oil cavity, the piston rod is pushed to move by overcoming the elastic force of a spring, meanwhile, the top of the piston rod is separated from a limiting hole, a rotating shaft of the equipment to be limited starts to rotate, and at the moment, the preparation step is completed;

the second step is that: a limiting step, after the equipment needing limiting rotates to the position, a controller sends a signal to drive a three-position three-way valve to start working, a valve core of the three-position three-way valve moves to close an oil inlet and simultaneously communicate an oil outlet and an oil return port, an oil cavity is communicated with a normal-pressure oil pool after the oil outlet is communicated with the oil return port, a piston rod is pushed by the elasticity of a spring to be inserted into a limiting hole, and the limiting step is finished;

the third step: a maintaining step, when the equipment needing to be limited needs to be continuously maintained for limiting, the controller sends a control signal to drive a three-position three-way valve to start working, a valve core of the three-position three-way valve moves, an oil outlet is closed after the valve core of the three-position three-way valve moves, an oil cavity is in a sealed state after the oil outlet is closed, and the maintaining step is finished at this moment;

the fourth step: and a separation step, when the equipment needing to be limited needs to rotate again, the controller sends a control signal to drive the three-position three-way valve to start working, the valve core of the three-position three-way valve moves, the oil inlet is communicated with the oil outlet after the valve core of the three-position three-way valve moves, hydraulic oil enters the oil cavity and pushes the piston rod to move by overcoming the elasticity of the spring after entering the oil cavity, meanwhile, the top of the piston rod is separated from the limiting hole, the rotating shaft of the equipment needing to be limited starts rotating after the top of the piston rod is separated from the limiting hole, and the separation step is completed at this moment.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the use method of the rotation limiting device, the elastic force of the spring and the hydraulic pressure of the piston are utilized to provide the thrust for the piston rod to drive the piston rod to move, the piston only does work when the piston rod is separated from the limiting hole, the thrust required by the piston rod to be inserted into and kept in the limiting hole is provided by the elastic force of the spring, energy consumption of a system is not needed in the limiting step, and the environment-friendly performance and the economical efficiency are high. Therefore, the design can utilize the elasticity of the spring to drive the piston rod to limit the limiting hole, the system does not need to continuously do work, the energy consumption of the system is effectively reduced, and the environmental protection performance and the economical efficiency are improved.

2. According to the rotary limiting device, the three-position three-way valve is used for connecting the piston and the hydraulic oil source, the extension, the shortening and the locking of the piston are controlled through three valve positions of the three-position three-way valve, meanwhile, when the system is in a keeping step, the three-position three-way valve can enable the piston to be kept in a closed state through a valve core in the middle position to close an oil outlet, the piston enables a spring to be kept in a compressed state continuously through hydraulic oil in the piston, the system does not need to work continuously in the whole keeping step, the control structure is simple and reliable, and the control method is stable and reliable. Therefore, the design controls the limiting device to work through the valve position of the three-position three-way valve, the control system is simple in structure, and the control method is stable and reliable.

3. The rotary limiting device provided by the invention has the advantages that the piston rod is inserted into and kept in the limiting hole by using the elastic force of the spring, the piston rod is respectively in sliding fit with the piston cylinder opening at the top of the piston and the through hole at the bottom of the piston, and meanwhile, the piston cylinder opening and the through hole provide radial support for the piston rod, so that the top of the piston rod is not easy to loosen when being subjected to the radial thrust of the limiting hole, and the limiting effect is stable and reliable. Therefore, the design can utilize the piston cylinder opening and the through hole to provide radial support for the piston rod, the structure is firm, and the reliability of the rotary limiting device is effectively improved.

4. According to the rotation limiting device, the piston rod is inserted into the limiting hole for limiting, the piston rod and the limiting hole do not have relative displacement in the limiting step, the loss of the limiting mechanism caused by the phenomenon of friction or collision is avoided, the service life is long, and the maintenance cost is low. Therefore, the design utilizes the piston rod to be inserted into the limiting hole for limiting, friction or collision cannot occur between the limiting mechanisms, the service life is effectively prolonged, and the maintenance cost is reduced.

Drawings

Fig. 1 is a schematic structural view of the present invention in a limiting state.

Fig. 2 is a schematic structural view of the present invention in a disengaged state.

Fig. 3 is a schematic structural view of a limit hole and a piston rod in embodiment 3 of the present invention.

Fig. 4 is a side view of the rotation stopper of the present invention.

In the figure: the device comprises a rotary limiting block 1, a round hole 11, a positioning wedge 12, a limiting hole 13, a rotating shaft 14, a positioning groove 15, a piston cylinder 2, a piston rod 21, a sealing plate 22, a spring 23, an oil cavity 24, a three-position three-way valve 25, a limiting block 26, an oil inlet 27, an oil outlet 28, an oil return port 29, a spring cavity 30 and a guide structure 31.

Detailed Description

The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.

Referring to fig. 1 to 4, a rotation limiting device, comprising: the rotary limiting turntable 1 and the piston cylinder 2 are rotated; the rotary limiting turntable 1 is of a disc structure, the rotary limiting turntable 1 is fixedly connected with a rotating shaft 14 of equipment needing limiting, the rotary limiting turntable 1 and the rotating shaft 14 are coaxially arranged, and a plurality of limiting holes 13 are uniformly formed in the outer circumference of the rotary limiting turntable 1; the piston cylinder 2 is internally provided with a telescopic piston rod 21, the piston rod 21 is arranged under the rotary limiting turntable, the piston rod 21 is inserted and matched with the limiting hole 13 after passing through a top plate of the piston cylinder 2, the piston rod 21 is in sliding fit with the side wall of the piston cylinder 2 through a sealing plate 22 arranged at the middle part of the piston rod, the sealing plate 22 is in sealing fit with the side wall of the piston cylinder 2, the sealing plate 22 divides the piston cylinder 2 into an oil cavity 24 and a spring cavity 30, the oil cavity 24 is communicated with a pressure oil source through a three-position three-way valve 25 arranged at the side part of the oil cavity 24, a spring 23 is arranged in the spring cavity 30, the spring 23 is in pressing fit with the sealing plate 22, and the bottom of the spring 23 is in pressing fit with the piston cylinder 2.

The oil chamber 24 is disposed above the sealing plate 22, the spring chamber 30 is disposed below the sealing plate 22, the top of the spring 23 is in press fit with the bottom of the sealing plate 22, and the bottom of the spring 23 is in press fit with the top of the sealing plate 22.

The piston rod 21 is provided with a limiting block 26, the limiting block 26 is arranged above a bottom plate of the piston cylinder 2, the limiting block 26 is in limiting fit with the bottom plate of the piston cylinder 2, and the piston rod 21 is in sliding fit with the bottom plate of the piston cylinder 2.

An oil inlet 27 of the three-position three-way valve 25 is communicated with a pressure oil source, an oil outlet 28 of the three-position three-way valve 25 is communicated with the oil cavity 24, and an oil return port 29 of the three-position three-way valve 25 is communicated with a normal-pressure oil pool.

The top of piston rod 21 is provided with guide structure 31, guide structure 31 is the frustum structure, guide structure 31 top diameter is 90% of bottom diameter, spacing hole 13 is the taper hole with guide structure 31 assorted.

The rotary limiting turntable 1 is fixedly connected with a rotating shaft 14 through a round hole 11 formed in the circle center of the rotary limiting turntable 1, at least two positioning wedges 12 are uniformly arranged on the edge of the round hole 11, at least two positioning grooves 15 are uniformly arranged at the end of the rotating shaft 14, the positioning grooves 15 and the positioning wedges 12 are correspondingly arranged, and the rotary limiting turntable 1 is fixedly connected with the positioning grooves 15 formed in the rotating shaft 14 through the positioning wedges 12 arranged on the rotary limiting turntable 1.

The number of the positioning wedges 12 is three.

The using method comprises the following steps:

the first step is as follows: the method comprises the steps that an operator opens a main switch of a rotary limiting device and a main switch of equipment to be limited, the rotary limiting device and the equipment to be limited start to work, after the rotary limiting device starts to work, the operator operates a controller to send a control signal to drive a three-position three-way valve 25 to start to work, a valve core of the three-position three-way valve 25 moves, after the valve core of the three-position three-way valve 25 moves, an oil inlet 27 is communicated with an oil outlet 28, hydraulic oil enters an oil cavity 24, the hydraulic oil enters the oil cavity 24 and pushes a piston rod 21 to move by overcoming the elastic force of a spring 23, meanwhile, the top of the piston rod 21 is separated from a limiting hole 13, after the top of the piston rod 21 is separated from the limiting hole 13, a rotating shaft 14 of the equipment to be limited starts to rotate, and at the moment, the preparation step is completed;

the second step is that: a limiting step, after the equipment needing limiting rotates to the position, a controller sends a signal to drive a three-position three-way valve 25 to start working, a valve core of the three-position three-way valve 25 moves to close an oil inlet 27 and simultaneously communicate an oil outlet 28 and an oil return port 29, after the oil outlet 28 and the oil return port 29 are communicated, an oil cavity 24 is communicated with a normal-pressure oil pool, a piston rod 21 is pushed by the elasticity of a spring 23 to be inserted into a limiting hole 13, and the limiting step is finished at this moment;

the third step: a maintaining step, when the equipment needing to be limited needs to be continuously maintained for limiting, the controller sends a control signal to drive the three-position three-way valve 25 to start working, a valve core of the three-position three-way valve 25 moves, an oil outlet 28 is closed after the valve core of the three-position three-way valve 25 moves, an oil cavity 24 is in a sealed state after the oil outlet 28 is closed, and the maintaining step is finished at this moment;

the fourth step: and a separation step, when the equipment needing to be limited needs to rotate again, the controller sends a control signal to drive the three-position three-way valve 25 to start working, the valve core of the three-position three-way valve 25 moves, after the valve core of the three-position three-way valve 25 moves, the oil inlet 27 is communicated with the oil outlet 28, hydraulic oil enters the oil cavity 24, the hydraulic oil pushes the piston rod 21 to move by overcoming the elasticity of the spring 23 after entering the oil cavity 24, meanwhile, the top of the piston rod 21 is separated from the limiting hole 13, after the top of the piston rod 21 is separated from the limiting hole 13, the rotating shaft 14 of the equipment needing to be limited starts to rotate, and the separation step is completed at this moment.

The principle of the invention is illustrated as follows:

the valve core in the three-position three-way valve used by the invention can be switched among three valve positions under the control of the electromagnetic coil, and the three valve positions are respectively as follows: a) sealing the oil return port while communicating the oil inlet with the oil outlet, b) sealing the oil return port, the oil inlet and the oil outlet simultaneously, c) sealing the oil inlet while communicating the oil return port with the oil outlet.

Example 1:

a rotation-limiting device, comprising: the rotary limiting turntable 1 and the piston cylinder 2 are rotated; the rotary limiting turntable 1 is of a disc structure, the rotary limiting turntable 1 is fixedly connected with a rotating shaft 14 of equipment needing limiting, the rotary limiting turntable 1 and the rotating shaft 14 are coaxially arranged, and a plurality of limiting holes 13 are uniformly formed in the outer circumference of the rotary limiting turntable 1; a telescopic piston rod 21 is arranged in the piston cylinder 2, the piston rod 21 is arranged right below the rotary limiting turntable, the piston rod 21 is inserted and matched with the limiting hole 13 after passing through a top plate of the piston cylinder 2, the piston rod 21 is in sliding fit with the side wall of the piston cylinder 2 through a sealing plate 22 arranged in the middle of the piston rod 21, the sealing plate 22 is in sealing fit with the side wall of the piston cylinder 2, the piston cylinder 2 is divided into an oil cavity 24 and a spring cavity 30 by the sealing plate 22, the oil cavity 24 is communicated with a pressure oil source through a three-position three-way valve 25 arranged on the side part of the oil cavity 24, a spring 23 is arranged in the spring cavity 30, the spring 23 is in pressing fit with the sealing plate 22, and the bottom of the spring 23 is in pressing fit with the piston cylinder 2; the piston rod 21 is provided with a limiting block 26, the limiting block 26 is arranged above a bottom plate of the piston cylinder 2, the limiting block 26 is in limiting fit with the bottom plate of the piston cylinder 2, and the piston rod 21 is in sliding fit with the bottom plate of the piston cylinder 2; an oil inlet 27 of the three-position three-way valve 25 is communicated with a pressure oil source, an oil outlet 28 of the three-position three-way valve 25 is communicated with the oil cavity 24, and an oil return port 29 of the three-position three-way valve 25 is communicated with a normal-pressure oil pool; the top of the piston rod 21 is provided with a guide structure 31, the guide structure 31 is of a frustum structure, the diameter of the top end of the guide structure 31 is 90% of the diameter of the bottom end, and the limiting hole 13 is a taper hole matched with the guide structure 31; the rotary limiting turntable 1 is fixedly connected with a rotating shaft 14 through a round hole 11 formed in the circle center of the rotary limiting turntable 1, at least two positioning wedges 12 are uniformly arranged on the edge of the round hole 11, at least two positioning grooves 15 are uniformly arranged at the end of the rotating shaft 14, the positioning grooves 15 and the positioning wedges 12 are correspondingly arranged, and the rotary limiting turntable 1 is fixedly connected with the positioning grooves 15 formed in the rotating shaft 14 through the positioning wedges 12 arranged on the rotary limiting turntable 1.

The using method comprises the following steps:

the first step is as follows: the method comprises the steps that an operator opens a main switch of a rotary limiting device and a main switch of equipment to be limited, the rotary limiting device and the equipment to be limited start to work, after the rotary limiting device starts to work, the operator operates a controller to send a control signal to drive a three-position three-way valve 25 to start to work, a valve core of the three-position three-way valve 25 moves, after the valve core of the three-position three-way valve 25 moves, an oil inlet 27 is communicated with an oil outlet 28, hydraulic oil enters an oil cavity 24, the hydraulic oil enters the oil cavity 24 and pushes a piston rod 21 to move by overcoming the elastic force of a spring 23, meanwhile, the top of the piston rod 21 is separated from a limiting hole 13, after the top of the piston rod 21 is separated from the limiting hole 13, a rotating shaft 14 of the equipment to be limited starts to rotate, and at the moment, the preparation step is completed;

the second step is that: a limiting step, after the equipment needing limiting rotates to the position, a controller sends a signal to drive a three-position three-way valve 25 to start working, a valve core of the three-position three-way valve 25 moves to close an oil inlet 27 and simultaneously communicate an oil outlet 28 and an oil return port 29, after the oil outlet 28 and the oil return port 29 are communicated, an oil cavity 24 is communicated with a normal-pressure oil pool, a piston rod 21 is pushed by the elasticity of a spring 23 to be inserted into a limiting hole 13, and the limiting step is finished at this moment;

the third step: a maintaining step, when the equipment needing to be limited needs to be continuously maintained for limiting, the controller sends a control signal to drive the three-position three-way valve 25 to start working, a valve core of the three-position three-way valve 25 moves, an oil outlet 28 is closed after the valve core of the three-position three-way valve 25 moves, an oil cavity 24 is in a sealed state after the oil outlet 28 is closed, and the maintaining step is finished at this moment;

the fourth step: and a separation step, when the equipment needing to be limited needs to rotate again, the controller sends a control signal to drive the three-position three-way valve 25 to start working, the valve core of the three-position three-way valve 25 moves, after the valve core of the three-position three-way valve 25 moves, the oil inlet 27 is communicated with the oil outlet 28, hydraulic oil enters the oil cavity 24, the hydraulic oil pushes the piston rod 21 to move by overcoming the elasticity of the spring 23 after entering the oil cavity 24, meanwhile, the top of the piston rod 21 is separated from the limiting hole 13, after the top of the piston rod 21 is separated from the limiting hole 13, the rotating shaft 14 of the equipment needing to be limited starts to rotate, and the separation step is completed at this moment.

Example 2:

example 2 is substantially the same as example 1 except that:

the oil chamber 24 is disposed above the sealing plate 22, the spring chamber 30 is disposed below the sealing plate 22, the top of the spring 23 is in press fit with the bottom of the sealing plate 22, and the bottom of the spring 23 is in press fit with the top of the sealing plate 22.

Example 3:

example 3 is substantially the same as example 2 except that:

the number of the positioning wedges 12 is three.