CN213235611U

CN213235611U - Self-locking hydraulic cylinder

Info

Publication number: CN213235611U
Application number: CN202022216214.6U
Authority: CN
Inventors: 陈冬根; 潘肖列
Original assignee: Zhejiang Tiangong Hydraulic Machinery Co ltd
Current assignee: Zhejiang Tiangong Hydraulic Machinery Co ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-05-18
Anticipated expiration: 2030-09-30

Abstract

The application relates to a self-locking hydraulic cylinder, which comprises a cylinder barrel, a cylinder bottom arranged at one end of the cylinder barrel, a piston tightly connected to the inner wall of the cylinder barrel in a sliding manner, a cylinder cover arranged at one end of the cylinder barrel far away from the cylinder bottom, a piston rod fixedly connected to the piston and penetrating through the cylinder cover, and a self-locking device arranged on the cylinder cover and keeping the extension length of the piston rod, wherein the self-locking device comprises a side block arranged on the cylinder cover and allowing the piston rod to penetrate through, a self-locking rack fixedly connected to the piston rod, a rack rod slidably connected to the side block, a rack rod fixedly connected to one end of the rack rod, facing the self-locking rack rod, and capable of being meshed with the self-locking rack, the movement of the self-locking rack and the piston rod connected with the self-locking rack is limited, and the piston can not generate larger impact on the cylinder bottom.

Description

Self-locking hydraulic cylinder

Technical Field

The application relates to the field of hydraulic cylinders, in particular to a self-locking hydraulic cylinder.

Background

The hydraulic cylinder is a hydraulic actuating element which converts hydraulic energy into mechanical energy and makes linear reciprocating motion or swinging motion, the existing high-quality hydraulic cylinder needs to achieve high precision and high quality by detecting the total stroke of 100 kilometers every 24 hours for 30 days, and the hydraulic cylinder needs to have a self-locking function in order to fix the position of a piston rod of the hydraulic cylinder when the piston rod extends out of a certain stroke.

The existing self-locking hydraulic cylinder is provided with a notice number of CN207921015U and comprises a cylinder barrel, a cylinder bottom, a guide sleeve, an air inlet, a first oil port and a return spring, wherein the cylinder bottom and the guide sleeve are respectively arranged at two ends of the cylinder barrel, a piston and a piston rod are arranged in the cylinder barrel, one end of the piston rod is fixedly connected with the piston, the other end of the piston rod extends out of the guide sleeve, the cylinder barrel is divided into a rod cavity and a rodless cavity by the piston, the air inlet is communicated with the rod cavity, the first oil port is communicated with the rodless cavity, a containing groove is axially formed in the rear end of the guide sleeve, the piston rod is provided with a stop block, the return spring is sleeved on the piston rod, one end of the return spring abuts against the bottom of the containing groove, the other end of the return spring abuts against the front end face of the stop block, the rear end face.

In view of the above-mentioned related art, the inventor believes that when unlocking, gas enters the rod cavity from the gas inlet to push the piston to move towards the cylinder bottom, which may cause the piston to have a large impact on the cylinder bottom, and has a defect that the cylinder bottom is easily damaged by the impact of the piston.

SUMMERY OF THE UTILITY MODEL

In order to reduce the impact of the piston on the cylinder bottom, the application provides a hydraulic cylinder capable of self-locking.

The application provides a but pneumatic cylinder of auto-lock adopts following technical scheme:

the utility model provides a pneumatic cylinder that can auto-lock, includes the cylinder, locates the cylinder bottom of cylinder one end, inseparable sliding connection in the piston of cylinder inner wall, locate cylinder and keep away from the cylinder cap of cylinder bottom one end, fixed connection in the piston and wear to locate the piston rod of cylinder cap, locate the cylinder cap and keep the self-lock device of the extension length of piston rod, self-lock device is including locating the cylinder cap and supplying the side piece that the piston rod wore to establish, fixed connection in the auto-lock rack of piston rod, sliding connection in the rack bar of side piece, fixed connection in rack bar orientation auto-lock rack one end and can engage in the rack and pinion of auto-lock rack, locate the rack bar actuating mechanism that.

By adopting the technical scheme, the rack rod drives the rod rack to move towards the self-locking rack, so that the complete gear is meshed with the self-locking rack, the self-locking rack and the piston rod connected to the self-locking rack cannot move randomly, the stroke of the piston cannot be changed easily, and meanwhile, when the piston is unlocked, the piston only needs to move in the reverse direction of the rack rod, so that the piston only can move, extra pressure cannot be generated along with the piston, the piston cannot cause large impact on the cylinder bottom, and a certain protection effect on the cylinder bottom is achieved.

Preferably, the rack rods are provided with a plurality of parts around the axis of the piston rod, and the self-locking racks are provided with a plurality of parts corresponding to each rack rod one by one around the axis of the piston rod.

By adopting the technical scheme, when one rack rod fails and cannot move, the corresponding rod rack can be driven to move towards the corresponding self-locking rack by moving other rack rods.

Preferably, the rack bar driving mechanism includes a threaded rod fixedly connected to the rack bar, a threaded cylinder rotatably connected to the side block and threadedly connected to the threaded rod, and a nut coaxially and fixedly connected to the threaded cylinder and rotatably connected to the outer wall of the side block.

Through adopting above-mentioned technical scheme, rotate the nut and can drive a screw thread section of thick bamboo and rotate for the threaded rod removes along screw thread section of thick bamboo length direction, makes then rack bar and driven and remove, does not exert external force simultaneously and gives the nut, and external force between a screw thread section of thick bamboo and the threaded rod also can make rack bar's removal receive the restriction, makes then the rack and pinion can mesh in the auto-lock rack more steadily.

Preferably, the side piece is attached to the fixed block of cylinder cap towards fixedly connected with in cylinder cap side, and the fixed block runs through and has seted up the screw hole, and cylinder cap threaded connection has the several to wear to locate the fixed screw in screw hole.

Through adopting above-mentioned technical scheme, will fix the screw and unscrew, can demolish the side piece from the end cover, be convenient for then demolish cylinder and the side piece that the damage appears to long-time the use so that retrieve respectively and recycle.

Preferably, the outer wall of the circumference of the piston rod is provided with a plurality of rack grooves, and each self-locking rack is fixedly connected with the inner bottom surface of each rack groove in a one-to-one correspondence manner.

By adopting the technical scheme, the self-locking rack is protected by the rack slot to a certain degree, the self-locking rack is not easy to be damaged, and then the rod rack can be stably meshed with the self-locking rack.

Preferably, the side of the side block deviating from the cylinder cover is provided with a plurality of guide wheel blocks, the guide wheel blocks are rotatably connected with a plurality of guide wheels which are connected to the outer wall of the circumference of the piston rod in a rolling manner, and all the guide wheels are uniformly arranged around the axis of the piston rod.

Through adopting above-mentioned technical scheme for the removal of piston rod is more stable, avoids the skew of piston rod to make the cylinder cap supply the position department that the piston rod wore to establish to take place to damage easily.

Preferably, the outer circumferential wall of the guide wheel is coaxially and fixedly connected with an anti-rotation circular ring block, the outer circumferential wall of the piston rod is provided with an anti-rotation groove with the length direction parallel to the length direction of the anti-rotation groove, and the anti-rotation circular ring block is positioned in the anti-rotation groove.

By adopting the technical scheme, the piston rod is not easy to rotate around the axis of the piston rod when in work, and then the rod rack can be stably meshed with the self-locking rack, so that the stroke of the piston rod can be well controlled.

Preferably, the guide wheel is located and all seted up the rubber groove on the ring piece both sides of preventing changeing, is equipped with the ring rubber piece in the rubber groove, and the part that the ring rubber piece exposes the rubber groove pastes in the circumference outer wall of guide wheel.

Through adopting above-mentioned technical scheme, the wearing and tearing reduce between guide pulley and the piston rod is made to the ring rubber piece, has the perimeter difference when the piston rod circumference surface simultaneously, and the ring rubber piece can compensate the difference to a certain extent for pressure between piston rod and the guide pulley can not too big and can not break away from mutually between guide pulley and the piston rod.

In summary, the present application includes at least one of the following benefits:

the rack rod drives the rod rack to move towards the self-locking rack, so that the gear is completely meshed with the self-locking rack, the self-locking rack and a piston rod connected to the self-locking rack cannot move randomly, the stroke of the piston cannot be changed easily, and meanwhile, during unlocking, the piston only can move by moving in the reverse direction of the rack rod, extra pressure cannot be generated along with the piston, the piston cannot cause large impact on a cylinder bottom, and a certain protection effect is achieved on the cylinder bottom;

the ring rubber block reduces the abrasion between the guide wheel and the piston rod, and meanwhile, when the circumference surface of the piston rod has a perimeter difference, the ring rubber block can make up the difference to a certain extent, so that the pressure between the piston rod and the guide wheel cannot be too large, and the guide wheel and the piston rod cannot be separated from each other.

Drawings

FIG. 1 is a schematic diagram of the main structure of the present application;

FIG. 2 is a schematic view of a partial cross-section of the side block facing away from the cylinder head to show the internal structure of the cylinder slot, the rack bar slot, and the piston rod circular hole;

fig. 3 is an enlarged view of a in fig. 2.

Description of reference numerals: 1. a cylinder barrel; 11. a circular ring rubber block; 13. a piston rod circular hole; 14. a rack bar slot; 15. a screw barrel groove; 2. a cylinder bottom; 21. a fixed block; 22. a screw hole; 23. fixing screws; 24. a rack slot; 25. a guide wheel block; 26. a guide wheel; 27. an anti-rotation ring block; 28. an anti-rotation slot; 29. a rubber groove; 31. a cylinder cover; 32. a piston rod; 33. a side block; 34. a self-locking rack; 35. a rack bar; 36. a rod rack; 37. a threaded rod; 38. a threaded barrel; 39. and a nut.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The embodiment of the application discloses pneumatic cylinder that can auto-lock, refer to fig. 1, including cylinder 1, the coaxial fixedly connected with cylinder bottom 2 of 1 length direction one end of cylinder, 1 inner wall of cylinder is along the piston of the inseparable sliding connection of self axis direction, the piston deviates from the coaxial fixedly connected with piston rod 32 in side of cylinder bottom 2, piston rod 32 is kept away from piston one end and is exposed in cylinder 1, cylinder 1 deviates from the coaxial fixedly connected with cylinder cap 31 of 2 one end of cylinder bottom, cylinder cap 31 is worn to locate by piston rod 32, cylinder cap 31 installs the self-lock device who keeps piston rod 32's the length that stretches out.

Referring to fig. 1 and 2, the self-locking device includes a side block 33 attached to the outer wall of the cylinder head 31 away from the cylinder barrel 1, the side block 33 is a rectangular body, a fixed block 21 is fixedly connected to the side of the side block 33 facing the cylinder head 31, the fixed block 21 is an annular body, a cylinder head groove for the cylinder head 31 to insert and slide into is formed in the side of the fixed block 21 facing the cylinder head 31, screw holes 22 are formed through four sides of the fixed block 21 parallel to the length direction of the cylinder barrel 1, a fixing screw 23 threaded to the cylinder head 31 is inserted into each screw hole 22, a piston rod circular hole 13 through which a piston rod 32 is inserted is formed through the side of the side block 33 facing the cylinder head 31, the axis of the piston rod circular hole 13 is the same as the axis of the piston rod 32, the diameter of the piston rod 32 is smaller than the diameter of the piston rod circular hole 13, four rack rod grooves 14 are uniformly formed on, the rack bar groove 14 is connected with a rack bar 35 in a sliding way along the length direction of the rack bar groove, the rack bar 35 is a rectangular body, one end of the rack bar 35, which faces to the piston rod 32, is fixedly connected with a bar rack 36, the outer circumferential wall of the piston rod 32 is provided with four rack grooves 24, the length direction of each rack groove 24 is parallel to the length direction of the piston rod 32, the inner wall of each rack groove 24 is fixedly connected with a self-locking rack 34 which can be meshed with the bar rack 36, the length direction of the self-locking rack 34 is parallel to the length direction of the piston rod 32, one end of the rack bar 35, which is provided with the bar rack 36, can extend into the rack groove 24, the side block 33 is provided with a rack bar driving mechanism which can control the rack bar 35 to move along the length direction of the side block, the rack bar driving mechanism comprises a threaded rod 37 fixedly connected to one end of the rack bar 35, which deviates from, the length direction of barrel groove 15 is on a parallel with the length direction of rack bar groove 14, and barrel groove 15 rotates and is connected with the screw thread section of thick bamboo 38 of inner wall threaded connection in the threaded rod 37 outer wall, and threaded section of thick bamboo 38 is kept away from the coaxial fixedly connected with nut 39 of threaded rod 37 one end, and the cross-section of nut 39 is the hexagon, and nut 39 outer wall and barrel groove 15 have sufficient interval to hexagonal spanner can stretch into and rotate nut 39 in barrel groove 15.

Referring to fig. 2 and 3, a guide wheel block 25 is fixedly connected to a side surface of the side block 33, which is away from the cylinder cover 31, the guide wheel block 25 is a circular ring body, an axis of the guide wheel block 25 is the same as an axis of the cylinder cover 31, the guide wheel block 25 is uniformly rotatably connected with four guide wheels 26 around an axis of the piston rod 32, the guide wheels 26 are connected to an outer wall of the piston rod 32 in a rolling manner, four anti-rotation grooves 28 are uniformly formed in an outer wall of the circumference of the piston rod 32 around the axis, a length direction of the anti-rotation grooves 28 is parallel to a length direction of the piston rod 32, an anti-rotation circular ring block 27 is coaxially and fixedly connected to an outer wall of the circumference of each guide wheel 26, a part of each anti-rotation circular ring block 27 extends into the anti-rotation groove 28, two rubber grooves 29 are coaxially formed in an outer wall of the circumference of each guide wheel 26, the, the part of the ring rubber block 11 exposed out of the rubber groove 29 is attached to the circumferential outer wall of the guide wheel 26.

The self-locking hydraulic cylinder of the embodiment of the application has the following implementation principle: when the piston rod 32 extends to a certain stroke, the hexagon socket wrench is inserted corresponding to the screw barrel groove 15, so that the nut 39 rotates, the screw barrel 38 synchronously rotates, the threaded rod 37 moves towards the piston rod 32, the threaded rod 37 drives the rack rod 35 to move together, the rod rack 36 is meshed with the self-locking rack 34, and then the movement of the piston rod 32 is limited.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a pneumatic cylinder that can auto-lock, includes cylinder (1), the cylinder end (2) of locating cylinder (1) one end, inseparable sliding connection in the piston of cylinder (1) inner wall, locate cylinder (1) and keep away from cylinder end (2) cylinder cap (31) of one end, fixed connection in piston and wear to locate piston rod (32) of cylinder cap (31), locate cylinder cap (31) and keep the self-lock device of the length of stretching out of piston rod (32), its characterized in that: the self-locking device comprises a side block (33) arranged on a cylinder cover (31) and used for a piston rod (32) to penetrate through, a self-locking rack (34) fixedly connected to the piston rod (32), a rack rod (35) connected to the side block (33) in a sliding mode, a rod rack (36) fixedly connected to the rack rod (35) and capable of being meshed with the self-locking rack (34) towards one end of the self-locking rack (34), and a rack rod driving mechanism arranged on the side block (33) and used for controlling the rack rod (35) to move.

2. A self-lockable hydraulic cylinder according to claim 1, characterized in that: the rack rods (35) are provided with a plurality of parts around the axis of the piston rod (32), and the self-locking racks (34) are provided with a plurality of parts corresponding to each rack rod (35) one by one around the axis of the piston rod (32).

3. A self-lockable hydraulic cylinder according to claim 2, characterized in that: the rack bar driving mechanism comprises a threaded rod (37) fixedly connected to a rack bar (35), a threaded cylinder (38) rotatably connected to a side block (33) and in threaded connection with the threaded rod (37), and a nut (39) coaxially and fixedly connected to the threaded cylinder (38) and rotatably connected to the outer wall of the side block (33).

4. A self-lockable hydraulic cylinder according to claim 1, characterized in that: side piece (33) are towards fixed block (21) of cylinder cap (31) side fixedly connected with laminating in cylinder cap (31), and screw hole (22) have been seted up in fixed block (21) run through, and cylinder cap (31) threaded connection has several fixed screw (23) of wearing to locate screw hole (22).

5. A self-lockable hydraulic cylinder according to claim 4, characterized in that: the outer wall of the circumference of the piston rod (32) is provided with a plurality of rack grooves (24), and each self-locking rack (34) is in one-to-one correspondence with the inner bottom surface of each rack groove (24) and is fixedly connected with the inner bottom surface of the rack groove.

6. A self-lockable hydraulic cylinder according to claim 1, characterized in that: the side of the side block (33) departing from the cylinder cover (31) is provided with a plurality of guide wheel blocks (25), the guide wheel blocks (25) are rotatably connected with a plurality of guide wheels (26) which are connected to the outer wall of the circumference of the piston rod (32) in a rolling manner, and all the guide wheels (26) are uniformly arranged around the axis of the piston rod (32).

7. A self-lockable hydraulic cylinder according to claim 6, characterized in that: the coaxial fixedly connected with of guide pulley (26) circumference outer wall prevents changeing ring piece (27), and length direction is seted up on piston rod (32) circumference outer wall and is on a parallel with self length direction's anti-rotation groove (28), prevents changeing ring piece (27) and is located anti-rotation groove (28).

8. A self-lockable hydraulic cylinder according to claim 7, characterized in that: rubber grooves (29) are formed in two sides of the guide wheel (26) located on the anti-rotation circular ring block (27), a circular ring rubber block (11) is arranged in each rubber groove (29), and the part, exposed out of each rubber groove (29), of each circular ring rubber block (11) is attached to the outer wall of the circumference of the guide wheel (26).