CN215059099U - Buffering element and power head buffering device with same - Google Patents

Abstract

The utility model relates to a buffering component and have unit head buffer of this component, including outer cylinder body subassembly, interior cylinder body subassembly and piston rod subassembly, the outer cylinder body subassembly is including being used for being connected with external device and bearing the outer cylinder body of interior cylinder body subassembly, piston rod subassembly, the inner cylinder body sliding seal of outer cylinder body and interior cylinder body subassembly is connected, inner cylinder body end connection inner cylinder body end cover subassembly, inner cylinder body end cover subassembly and piston rod subassembly's piston rod sliding seal are connected, the piston rod is connected and is strikeed the head, it with clearance fit between the interior cylinder body to strike the head, the interior inner chamber of interior cylinder body is injected with the cement. The utility model discloses have good buffering, inhale shake effect and more reliable usability and life.

Description

Buffering element and power head buffering device with same

Technical Field

The utility model relates to a power buffering field, concretely relates to buffering component and have unit head buffer of this component.

Background

The working mode of the rotary drilling rig is often a rock entering mode, the power head part serves as a power/torque output unit and also serves as one of the most direct impact points of vibration during the rock entering mode, therefore, the buffer device is arranged at the power head part, and springs and rubber buffer elements in different quantities and types are arranged according to the buffer requirements. However, due to the limitations of structural size and the like, the rubber buffer element cannot fully satisfy the buffer performance and cannot absorb the vibration, so that the structural member on the power head and the speed reducer casing often have cracks and cracks due to the vibration.

In order to solve the problem of insufficient buffering capacity, an oil pressure buffering element is usually adopted to replace a rubber buffering element in the prior art, namely oil is adopted to realize the absorption of impact shock through damping. However, due to the sealing problem of the oil pressure buffer element, the oil often seeps out after the oil pressure buffer element is used for a period of time, and even the guide rod cannot be ejected normally.

In the prior art, no cement buffer is fully applied to the related technology of a rotary drilling rig, and the technology related to the cement buffer is mostly applied to the field of railway vehicles. Like chinese utility model patent CN210164837U, its major structure has cylinder body, piston rod, end cover, combined seal circle, elasticity clay, sealed clamping ring, mounting, first guide ring, second guide ring, base, guide pin bushing, dust ring. The elastic daub is poured into the cylinder body, the combined sealing ring is installed in an inner hole of the end cover and then fastened by the sealing press ring, the piston rod penetrates through the combined sealing ring and then is installed on the end cover and can freely move in the axial direction and the circumferential direction, then the end rod assembly with the piston rod is connected and fastened with the cylinder body through threads on the end rod assembly, and finally the assembly is installed in the guide sleeve, so that the daub buffering element is assembled. The working principle of the buffer element is as follows: when an object impacts the upper end of the cylinder body, the piston rod can be stressed and then extrudes the elastic daub in the cylinder body, and the impact force is buffered through the elastic performance of the elastic daub. Wherein the base and the guide sleeve are present as a connection to an external object.

In summary, the following problems mainly exist in the prior art:

firstly, no daub buffer element applied to the rotary drilling rig exists in the prior art;

secondly, in the daub buffer element in the prior art, the upper end of the guide sleeve is not provided with a dustproof design, so that impurities such as silt and the like can easily enter, and the problems of clamping stagnation, transitional wear and even shaking of the barrel body are caused;

thirdly, oil leakage easily occurs in the oil pressure buffering element: when the high-frequency small vibration is borne, the dynamic sealing performance of high-pressure oil is poor, and oil leakage is easy to occur; the rotary drilling rig has more muddy water in the working environment, and the early failure of sealing is easily caused to generate oil leakage; when the oil pressure buffer element bears overload impact, the sealing element is easy to be broken, so that oil is leaked;

fourthly, the oil pressure buffering element causes pressure reduction due to oil leakage and the like, and finally, the problems that the guide rod cannot be ejected and buffering is invalid are caused;

the sealing requirement of the oil pressure buffering element is high, so that the manufacturing precision is high, and the cost is increased.

In view of this, the utility model provides an use the cement to carry out buffering component and unit head buffer that cushions to solve the problem that the shock-absorbing capacity of the last buffering component of digging the rig soon, especially rubber buffering component is not enough, the buffering effect is poor, also avoided the oil leak that oil pressure buffering component exists simultaneously, the guide arm does not kick-back the scheduling problem.

SUMMERY OF THE UTILITY MODEL

The utility model provides a buffering component promotes the shock-absorbing capacity through adopting the inside seal structure of elasticity clay and component to solve exist among the prior art not enough. The to-be-solved technical problem of the utility model is realized through following technical scheme.

In a cushioning element comprising an outer cylinder assembly, an inner cylinder assembly, and a piston rod assembly, the improvement comprising: the outer cylinder body assembly comprises an outer cylinder body which is used for being connected with an external device and bearing an inner cylinder body assembly and a piston rod assembly, the outer cylinder body is connected with an inner cylinder body of the inner cylinder body assembly in a sliding and sealing mode, the end part of the inner cylinder body is connected with an inner cylinder body end cover assembly, the inner cylinder body end cover assembly is connected with a piston rod of the piston rod assembly in a sliding and sealing mode, the piston rod is connected with an impact head, the impact head is in clearance fit with the inner cylinder body, and the inner cavity of the inner cylinder body is filled with elastic cement; a boss is arranged at the inner bottom end of the outer cylinder body and is abutted against the lower end face of the piston rod; the end part of the inner cylinder body, which is exposed out of the outer cylinder body, slides downwards in the outer cylinder body after being impacted by load, and simultaneously drives the end cover assembly of the inner cylinder body to slide downwards along the piston rod, and the elastic daub is extruded by the inner cylinder body and the impact head to deform and generate friction damping in a gap between the inner cylinder body and the impact head; after the load impact disappears, the elastic daub enables the inner cylinder body and the inner cylinder body end cover assembly to rebound and reset.

Preferably, the outer cylinder body subassembly still includes copper sheathing I, skeleton oil blanket I and outer cylinder body end cover, copper sheathing I locate on the step of outer cylinder body inner wall and with inner cylinder body sliding fit, skeleton oil blanket I locates copper sheathing I upper end, the outer cylinder body end cover locate the port department of outer cylinder body and with inner cylinder body clearance fit.

Preferably, the outer cylinder body subassembly still includes copper sheathing I, skeleton oil blanket I, hole with retaining ring I and dust excluder, copper sheathing I locate on the step of outer cylinder body inner wall and with inner cylinder body sliding fit, skeleton oil blanket I locates copper sheathing I upper end, skeleton oil blanket I upper end is located to hole with retaining ring I, outer cylinder body port department bonds the dust excluder.

Preferably, the outer cylinder body comprises a base and a cylinder body in threaded connection with the base, an elastic pin is arranged at the threaded connection position of the base and the cylinder body, and a threaded connection part used for being connected with an external device is arranged at the bottom of the base.

Preferably, the inner cylinder body assembly further comprises a nylon sleeve, a step and an annular groove are arranged on the outer side of the opening end of the inner cylinder body, and the nylon sleeve is installed in the annular groove.

Preferably, the piston rod assembly further comprises a shaft end check ring and a steel ball, the impact head is in threaded connection with the piston rod, a stepped hole is formed in the impact head, the steel ball is mounted at the upper end of the stepped hole, and the shaft end check ring is arranged at the upper end of the stepped hole.

Preferably, the inner cylinder body end cover assembly comprises an inner cylinder body end cover in threaded connection with the inner cylinder body, and an O-ring is arranged between the inner cylinder body end cover and the inner cylinder body; the inner cylinder body end cover is provided with a stepped hole, a framework-free oil seal, a copper bush II, a framework oil seal II and a hole retainer ring II are sequentially arranged in the stepped hole from bottom to top, and the framework oil seals II are a group of framework oil seals which are in the same direction and face the direction of the impact head; the end cover assembly of the inner cylinder body is connected with the piston rod in a sliding and sealing mode through a framework oil seal II, a copper sleeve II and a framework-free oil seal.

Preferably, the inner cylinder end cover is provided with an elastic daub injection stepped hole, the upper part of the injection stepped hole is provided with a steel ball II, the steel ball II is limited in the injection stepped hole by a pin, and the lower end of the injection stepped hole is provided with a plug.

Preferably, the lower part of the outer cylinder body is provided with an air hole.

The utility model also provides a unit head buffer, its technical scheme as follows.

The improvement of a power head buffer device is that: comprising a cushioning element as described in any of the preceding.

Compared with the prior art, the utility model discloses following beneficial effect has.

The arrangement of the internal sealing structure can fully avoid the leakage of the daub.

The framework oil seal II is arranged to seal the elastic daub with certain pressure, so that the leakage of the elastic daub is blocked; by arranging the frameless oil seal, impurities such as dust and the like in the inner cavity of the outer cylinder body are prevented from being brought into the inner cavity of the inner cylinder body by the piston rod; the framework oil seal II and the frameless oil seal are arranged in the inner cavity of the end cover of the inner cylinder body, and the coaxiality of the framework oil seal II and the frameless oil seal, the copper sleeve II and the piston rod can be ensured; the setting of hole retainer ring II can guarantee skeleton oil blanket II's reliable location, prevents that skeleton oil blanket II from appearing the displacement.

Secondly, the dustproof sealing mode avoids external impurities from being mixed into the elastic daub, thereby ensuring the performance of the elastic daub.

The frameless oil seal is arranged at the lower end of the stepped hole of the end cover of the inner cylinder body through the elastic deformation of the frameless oil seal, so that impurities existing in the inner cavity of the outer cylinder body are prevented from entering the inner cavity of the inner cylinder body along with the surface of the piston rod, and further, the pollution of elastic cement is avoided; meanwhile, the frameless oil seal also prevents the inner hole of the copper bush II from entering impurities, thereby ensuring the performances of guidance, self-lubrication and the like provided by the copper bush II.

The framework oil seal I can prevent impurities such as silt and the like in the construction process of the rotary drilling rig from entering the inner cavities of the copper sleeve I, the nylon sleeve and even the outer cylinder body; the inner hole of the end cover of the outer cylinder body and the excircle of the inner cylinder body form a clearance seal, so that large granular substances are prevented from entering.

The nylon sleeve has certain elasticity and self-lubricating property, can block impurities, particularly copper scraps generated by the abrasion of the copper sleeve I in the using process from entering the inner cavity of the outer cylinder body, and can also provide certain guiding property for the inner cylinder body assembly.

And thirdly, the guide and self-lubricating effect.

The copper bush I is arranged at the upper end of the inner wall of the outer cylinder body, the coaxiality of the copper bush I and the inner hole at the lower end of the inner wall of the outer cylinder body can be guaranteed, vertical guidance is provided for the inner cylinder body assembly, the stress of the inner side wall of the outer cylinder body is reduced, and the impact force is guaranteed to be buffered and absorbed.

Copper sheathing II sets up in the shoulder hole of inner cylinder body end cover, under the coaxial condition of assurance and skeleton oil blanket II, no skeleton oil blanket, guarantees simultaneously to have even damping clearance between impact head excircle and the inner cylinder body inner wall to the buffering of impact force and inhale the shake effect have been guaranteed.

In addition, all inlay on copper sheathing I and copper sheathing II's the internal surface and have graphite material, when guaranteeing buffering, inhale shake the effect, can also provide self-lubricating effect to eliminate the excessive wearing and tearing that appear because relative motion between each contact spare part, provide lubricated guarantee for the smooth and easy operation of each spare part.

Fourthly, the processing difficulty and the processing cost are reduced.

The impact head and the piston rod are two independent parts which are in threaded connection, so that the piston rod assembly is of a split structure. Compared with the integrated piston rod assembly, the split piston rod assembly has the advantages that the processing difficulty and the processing cost are reduced.

In addition, the piston rod is connected with the impact head, and a shoulder is arranged on the piston rod, so that the coaxial installation of the piston rod and the impact head can be ensured.

Fifthly, buffering and shock absorption effects.

When the inner cylinder body is acted by external impact force, the elastic daub can be led to the gap between the impact head and the inner cylinder body. Because the elastic daub has the characteristics of high damping property, viscoelasticity, volume compressibility, flowability and the like, the consumption of impact energy is completed when the elastic daub enters the gap, namely, the gap damping is formed, the impact force can be stably reduced to zero, and the stress is kept stable. The rate of energy dissipation is primarily related to the initial velocity and mass at impact, with different impact velocities and masses resulting in different cushioning curves. Because the characteristic of elasticity daub and clearance damped setting, the utility model discloses a buffer element not only can be applicable to the little impact of high frequency, alleviates the structure because the fatigue that the impact brought, can also be applicable to the big impact of low frequency better, ensures that the structure only receives stable effort when receiving the impact. In other words, the impact energy range adapted to the buffering element of the present invention is wider than the application range of the oil pressure buffering element.

The impact head comprises a stepped hole on the impact head, a steel ball arranged in the stepped hole and a shaft end check ring arranged at the end part of the stepped hole, wherein the three components are arranged to form a one-way damping unit. When the steel ball bears the impact, the steel ball is positioned at the lower part of the upper end part of the stepped hole, so that elastic daub is prevented from entering the stepped hole; after the impact acting force disappears, the inner cylinder body rebounds, the steel balls are located on the upper portion of the upper end portion of the stepped hole and are limited in the stepped hole by the shaft end retainer ring, so that instantaneous negative pressure of the low-pressure cavity appearing when the inner cylinder body rebounds is eliminated, the influence of the instantaneous negative pressure on rebounding of the inner cylinder body is avoided, and the next impact can be met more quickly. The formation of one-way damping unit makes the utility model discloses a buffer element can be used to the high frequency and strike. The number of the unidirectional damping units can be set according to actual needs, the unidirectional damping units are generally set according to the multiple of three, and meanwhile, the performance of the unidirectional damping units can be set by changing the size of the stepped hole.

The buffer element of the utility model can buffer the object with the mass of about three tons and the impact speed of not more than 6 m/s. Under the same condition, to the buffer capacity of the big impact of low frequency, rubber buffer element is only 3-5KJ, and oil pressure buffer element can reach about 20KJ, the utility model discloses a buffer element also can reach about 20 KJ.

Because the flow property of elasticity clay is poor than the flow property of fluid, through the utility model discloses buffer element's seal structure can effectively avoid the problem of sealed inefficacy.

One-way damping unit and clearance damped setting to and the characteristic of elasticity daub, make the utility model discloses a buffer element can be suitable for more extensive impact frequency, thereby avoids the high frequency impact when constructing to buffer element's damage.

Seventh, when the power head buffering element of the present invention is applied to a rotary drilling rig, the vibration of the whole machine of the rotary drilling rig can be reduced better when the rotary drilling rig enters a rock, and the reliability and the overall life of the whole machine can be improved; based on the design, designers of the whole machine can design equipment with deeper drilling holes, larger diameter and harder rock entering.

In summary, compared with the prior art, the utility model discloses have good buffering, inhale shake effect and more reliable usability and life.

Drawings

FIG. 1 is a schematic cross-sectional view of a buffering element according to the present invention;

fig. 2 is a schematic view of an embodiment of a sealing structure at an end cap of an outer cylinder in a cushioning element according to the present invention;

FIG. 3 is a schematic view of an embodiment of an outer cylinder structure in the buffering element of the present invention;

FIG. 4 is a schematic structural view of the buffer element of the present invention in an impact stress state;

fig. 5 is a schematic view of a front view structure of the power head buffering device of the present invention;

fig. 6 is a schematic view of a top view structure of the power head buffering device of the present invention;

FIG. 7 is a first schematic structural diagram of CN210164837U in the prior art;

FIG. 8 is a diagram illustrating a structure of CN210164837U in the prior art;

the reference numbers in the drawings are, in order: 10. the damping device comprises a damping element 20, a power damping device 30, a spring 1, an outer cylinder body assembly 11, an outer cylinder body 12, a copper sleeve I, 13, a framework oil seal I, 14, an outer cylinder body end cover 15, a screw 16, a hole retainer ring I, 17, a dust strip 18, a vent hole 111, a base 112, a cylinder body 113, an elastic pin 2, an inner cylinder body assembly 21, an inner cylinder body 22, a nylon sleeve 3, a piston rod assembly 31, a shaft end retainer ring 32, a steel ball I, 33, an impact head 34, a piston rod 4, an inner cylinder body end cover assembly 41, an inner cylinder body end cover 42, a frameless oil seal 43, a copper sleeve II, 44, a plug 45, a framework oil seal II, 46, an O-shaped ring 47, a steel ball II, 48, a hole retainer ring II, 49, a pin, 5 and elastic daub.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example 1:

referring to fig. 1, a cushioning member comprising an outer cylinder assembly 1, an inner cylinder assembly 2 and a piston rod assembly 3 is improved in that: the outer cylinder body assembly 1 comprises an outer cylinder body 11 which is used for being connected with an external device and bearing an inner cylinder body assembly 2 and a piston rod assembly 3, the outer cylinder body 11 is connected with an inner cylinder body 21 of the inner cylinder body assembly 2 in a sliding and sealing mode, the end portion of the inner cylinder body 21 is connected with an inner cylinder body end cover assembly 4, the inner cylinder body end cover assembly 4 is connected with a piston rod 34 of the piston rod assembly 3 in a sliding and sealing mode, the piston rod 34 is connected with an impact head 33, the impact head 33 is in clearance fit with the inner cylinder body 21, and an inner cavity of the inner cylinder body 21 is filled with elastic cement 5; a boss is arranged at the inner bottom end of the outer cylinder body 11 and is abutted against the lower end face of the piston rod 34; the end part of the inner cylinder body 21 exposed out of the outer cylinder body 11 is impacted by a load and then slides downwards in the outer cylinder body 11, and simultaneously drives the inner cylinder body end cover assembly 4 to slide downwards along the piston rod 34, and the elastic daub 5 is extruded by the inner cylinder body 21 and the impact head 33 to deform and generate friction damping in a gap between the inner cylinder body 21 and the impact head 33; after the load impact disappears, the elastic daub 5 enables the inner cylinder body 21 and the inner cylinder body end cover assembly 4 to rebound and reset.

In this embodiment: the outer cylinder body assembly 1 is used as a connecting part of the rotary drilling rig, and the appearance, the structural size and the connecting size of the outer cylinder body assembly are consistent with those of the connecting part of the rotary drilling rig; the inner cylinder body component 2 is the main part of the utility model, is used for filling the elastic daub 5 and is used as the active area of the elastic daub 5, and simultaneously ensures the sealing and the linear reciprocating motion of the piston rod 34; the piston rod assembly 3 is an assembly which impacts the elastic daub 5 according to external impact received by the inner cylinder body 21 so as to realize a buffering effect.

Further, the lower part of the outer cylinder body 11 is provided with an air hole 18. In this embodiment: the air holes 18 can ensure the consistency of the internal pressure and the external pressure of the external cylinder body 11, thereby avoiding the negative pressure generated in the inner cavity of the external cylinder body 11 from influencing the resetting of the internal cylinder body 21.

The cushion member of the present embodiment uses an elastic cement having characteristics such as high damping property, viscoelasticity, volume compressibility, and flowability. The elastic daub can generate extrusion deformation after being impacted and has elasticity, energy reduction and absorption are realized through a damping gap set by a structural part along with the impact action, the impact force can be stably reduced to zero, a heavy object is supported by the elasticity of the elastic daub, and the stable stress state is kept; when the impact object disappears, the elastic daub can rebound instantaneously and ensure the resetting of the inner cylinder body assembly due to the characteristics of viscoelasticity, volume compressibility and the like of the elastic daub, and waits for subsequent impact.

Example 2:

on the basis of embodiment 1, refer to fig. 1 and show, external cylinder body subassembly 1 still includes copper sheathing I12, skeleton oil blanket I13 and external cylinder body end cover 14, copper sheathing I12 locate on the step of external cylinder body 11 inner wall and with interior cylinder body 21 sliding fit, skeleton oil blanket I13 locates copper sheathing I12 upper end, external cylinder body end cover 14 locate the port department of external cylinder body 11 and with interior cylinder body 21 clearance fit.

Further, the outer cylinder end cover 14 is fixedly arranged at a port of the outer cylinder 11 through a screw 15.

Further, the copper bush I12 is a self-lubricating copper bush, and a graphite material is embedded in the surface of the inner hole of the copper bush I12.

In this embodiment: the copper bush I12 ensures that the inner cylinder 21 moves along the axial direction in the outer cylinder 11; the framework oil seal I13 seals the inner cylinder body 21, so that impurities such as external silt are prevented from entering the inner cylinder body 12 and the outer cylinder body 11; the outer cylinder body end cover 14 is in clearance fit with the inner cylinder body 21 through an inner hole of the outer cylinder body end cover, so that clearance type sealing between the outer cylinder body end cover 14 and the inner cylinder body 21 is realized, and the probability of entering impurities such as external silt is further reduced; the outer cylinder end cover 14 is fixed at the port of the outer cylinder 11 through a set of screws 15, so that the function of limiting the axial displacement of the framework oil seal I13 and the copper bush I12 is achieved.

Example 3:

on the basis of embodiment 1, refer to fig. 2 and show, external cylinder body subassembly 1 still includes copper sheathing I12, skeleton oil blanket I13, hole retaining ring I16 and dust excluder 17, copper sheathing I12 locate on the step of external cylinder body 11 inner wall and with interior cylinder body 21 sliding fit, skeleton oil blanket I13 locates copper sheathing I12 upper end, hole retaining ring I16 locates skeleton oil blanket I13 upper end, the dust excluder 17 that bonds is located to external cylinder body 11 port department.

Furthermore, a groove is arranged at the port of the outer cylinder body 11, and the dust-proof strip 17 is bonded in the groove.

Further, the copper bush I12 is a self-lubricating copper bush, and a graphite material is embedded in the surface of the inner hole of the copper bush I12.

In this embodiment: the copper bush I12 ensures that the inner cylinder 21 moves along the axial direction in the outer cylinder 11; the framework oil seal I13 seals the inner cylinder body 21, so that impurities such as external silt are prevented from entering the inner cylinder body 12 and the outer cylinder body 11; the hole retainer ring I16 plays a role in limiting the axial displacement of the framework oil seal I13 and the copper bush I12; the dust-proof strip 17 can more reliably prevent the entry of silt and even water.

Example 4:

on the basis of any of the foregoing embodiments, referring to fig. 3, the external cylinder 11 includes a base 111 and a cylinder 112 screwed to the base 111, a resilient pin 113 is disposed at a screwed joint between the base 111 and the cylinder 112, and a screwed connection portion for connecting to an external device is disposed at a bottom of the base 111.

In this embodiment: the split type outer cylinder body 11 is formed by the base 111 and the cylinder body 112, so that the manufacturing cost of the outer cylinder body 11 can be reduced, and meanwhile, the manufacturing convenience of the outer cylinder body 11 is improved; the resilient pin 113 prevents the threaded connection between the base 111 and the barrel 112 from loosening.

Example 5:

on the basis of any one of the above embodiments, the internal cylinder assembly 2 further includes a nylon sleeve 22, a step and an annular groove are provided on the outer side of the open end of the internal cylinder 21, and the nylon sleeve 22 is installed in the annular groove.

In this embodiment: the steps of the inner cylinder body 21 correspond to the steps of the outer cylinder body 11, and the copper bush I12 is arranged between the two steps so as to limit the maximum upward stroke of the inner cylinder body 21; the nylon sleeve 22 is used to ensure normal axial movement of the inner cylinder assembly 2 within the outer cylinder assembly 1.

Example 6:

on the basis of any one of the above embodiments, the piston rod assembly 3 further includes a shaft end retaining ring 31 and a steel ball 32, the impact head 33 is in threaded connection with the piston rod 34, a stepped hole is formed in the impact head 33, the steel ball 32 is mounted at the upper end of the stepped hole, and the shaft end retaining ring 31 is arranged at the upper end of the stepped hole.

In this embodiment: the shaft end retainer ring 31, the steel ball 32 and the stepped hole form a one-way damping unit together; when the inner cylinder body 21 descends, the elastic daub 5 generates friction damping through a gap between the inner cylinder body 21 and the impact head 33, and at the moment, the steel ball 32 is positioned at the lower part of the upper end part of the stepped hole, so that the elastic daub 5 is prevented from entering the stepped hole; when the inner cylinder body 21 moves upwards, the steel balls 32 are positioned at the upper part of the upper end part of the stepped hole and are limited in the stepped hole by the shaft end retainer ring 31, so that instantaneous negative pressure of the low-pressure cavity when the inner cylinder body 21 rebounds is eliminated, and further the influence of the instantaneous negative pressure on the rebound of the inner cylinder body 21 is avoided.

Example 7:

on the basis of any of the previous embodiments, the inner cylinder end cover assembly 4 comprises an inner cylinder end cover 41 in threaded connection with the inner cylinder 21, and an O-ring 46 is arranged between the inner cylinder end cover 41 and the inner cylinder 21; the inner cylinder body end cover 41 is provided with a stepped hole, a framework-free oil seal 42, a copper bush II43, a framework oil seal II45 and a hole check ring II48 are sequentially arranged in the stepped hole from bottom to top, and the framework oil seal II45 is a group of framework oil seals which are in the same direction and face the direction of the impact head 33; the inner cylinder body end cover assembly 4 is connected with the piston rod 34 in a sliding and sealing mode through a framework oil seal II45, a copper sleeve II43 and a frameless oil seal 42.

Further, the copper bush II43 is a self-lubricating copper bush, and a graphite material is embedded on the inner surface of the copper bush II 43.

In this embodiment: the threaded sealing connection between the inner cylinder body 21 and the inner cylinder body end cover 41 is realized through the O-shaped ring 46, so that the elastic daub 5 is always positioned in the inner cavity of the inner cylinder body 21, namely when the inner cylinder body 21 moves upwards or downwards, the elastic daub is always sealed in the inner cavity of the inner cylinder body 21; the framework oil seals II45 are a group of framework oil seals in the same direction, and can seal the elastic daub 5 in the inner cylinder body 21, so that the elastic daub 5 is prevented from entering a stepped hole of the end cover 4 of the inner cylinder body; the hole check ring II48 is used for limiting the framework oil seal II 45; the copper bush II43 is used for ensuring the linear motion of the inner cylinder body end cover assembly 4 relative to the piston rod 34 and playing a certain lubricating effect, thereby avoiding the clamping stagnation phenomenon when the inner cylinder body end cover assembly 4 moves upwards or downwards; the frameless oil seal 42 serves to prevent foreign matter such as dust in the inner chamber of the outer cylinder block 11 from being carried into the inner chamber of the inner cylinder block 21 by the piston rod 34.

Example 8:

on the basis of embodiment 7, an elastic daub injection stepped hole is formed in the inner cylinder end cover 41, a steel ball II47 is mounted at the upper portion of the injection stepped hole, the steel ball II47 is limited in the injection stepped hole by a pin 49, and a plug 44 is mounted at the lower end of the injection stepped hole.

In this embodiment: the injection stepped hole is used for injecting projectile cement 5 into the inner cylinder body 21; the plug 44 is used for plugging the injection stepped hole and preventing the elastic daub 5 from entering the inner cavity of the outer cylinder body 11 from the injection stepped hole.

Example 9:

referring to fig. 5 and 6, the power head buffering device is improved in that: comprising a cushioning element as described in any of embodiments 1-8.

Further, the power head buffering device further comprises a spring 30, and the spring 30 and the buffering element 10 are arranged at intervals.

Furthermore, the number of the buffer elements 10 is three, and the buffer elements are uniformly distributed along the circumferential direction; the number of the springs 30 is nine, each three springs 30 form a group, and a group of springs 30 is arranged between adjacent buffer elements 10.

In this embodiment, the buffer element 10 is vertically installed on a power head structural member of the rotary drilling rig, and after being impacted by a heavy object, the buffer element firstly contacts with an impact object from the top of the inner cylinder body 21 and rapidly moves downwards along with the impact; the lower end of a piston rod 34 of the piston rod assembly 3 is always contacted with a boss at the bottom in the outer cylinder body 11, and the impact head 33 instantly begins to extrude the elastic daub 5 at a high speed; the elastic daub 5 starts to generate friction damping along the gap between the inner cylinder body 21 and the impact head 33 under the extrusion of high-speed large impact energy, and along with the lapse of impact time, the damping force of the elastic daub 5 passing through the gap is gradually stabilized, and the kinetic energy is gradually reduced to zero, namely, the effect of energy absorption is achieved. In the impact process, the one-way damping unit arranged on the impact head 33 is always in a closed state, namely the steel balls 32 are positioned at the lower part of the upper end part of the stepped hole of the impact head 33, so that the stepped hole is blocked, namely the elastic daub 5 realizes damping and shock absorption through the gap between the impact head 33 and the inner cylinder body 21. When the weight stops impacting and moves away, the elastic daub 5 generates rapid rebound due to the difficult compressibility and elasticity of the elastic daub, and the inner cylinder body assembly 2 generates rapid rebound.

It should be noted that the above detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. Furthermore, it will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than those illustrated or otherwise described herein.

Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may also be oriented in other different ways, such as by rotating it 90 degrees or at other orientations, and the spatially relative descriptors used herein interpreted accordingly.

In the foregoing detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, like numerals typically identify like components, unless context dictates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A cushioning element comprising an outer cylinder assembly (1), an inner cylinder assembly (2) and a piston rod assembly (3), characterized in that: the outer cylinder body assembly (1) comprises an outer cylinder body (11) which is used for being connected with an external device and bearing an inner cylinder body assembly (2) and a piston rod assembly (3), the outer cylinder body (11) is connected with an inner cylinder body (21) of the inner cylinder body assembly (2) in a sliding and sealing mode, the end part of the inner cylinder body (21) is connected with an inner cylinder body end cover assembly (4), the inner cylinder body end cover assembly (4) is connected with a piston rod (34) of the piston rod assembly (3) in a sliding and sealing mode, the piston rod (34) is connected with an impact head (33), the impact head (33) is in clearance fit with the inner cylinder body (21), and an inner cavity of the inner cylinder body (21) is filled with elastic cement (5); a boss is arranged at the inner bottom end of the outer cylinder body (11) and is abutted against the lower end face of the piston rod (34); the end part of the inner cylinder body (21), which is exposed out of the outer cylinder body (11), slides downwards in the outer cylinder body (11) after being impacted by load, and simultaneously drives the end cover assembly (4) of the inner cylinder body to slide downwards along the piston rod (34), and the elastic cement gum (5) is extruded by the inner cylinder body (21) and the impact head (33) to deform and generate friction damping in a gap between the inner cylinder body (21) and the impact head (33); after the load impact disappears, the elastic daub (5) enables the inner cylinder body (21) and the end cover assembly (4) of the inner cylinder body to rebound and reset.

2. A cushioning element according to claim 1, wherein: outer cylinder body subassembly (1) still includes copper sheathing I (12), skeleton oil blanket I (13) and outer cylinder body end cover (14), on the step of outer cylinder body (11) inner wall was located in copper sheathing I (12) and with inner cylinder body (21) sliding fit, copper sheathing I (12) upper end is located in skeleton oil blanket I (13), the port department of outer cylinder body (11) and with inner cylinder body (21) clearance fit are located in outer cylinder body end cover (14).

3. A cushioning element according to claim 1, wherein: outer cylinder body subassembly (1) still includes copper sheathing I (12), skeleton oil blanket I (13), hole with retaining ring I (16) and dust excluder (17), on the step of outer cylinder body (11) inner wall was located in copper sheathing I (12) and with inner cylinder body (21) sliding fit, copper sheathing I (12) upper end is located in skeleton oil blanket I (13), skeleton oil blanket I (13) upper end is located in hole with retaining ring I (16), outer cylinder body (11) port department bonds dust excluder (17).

4. A cushioning member according to any one of claims 1-3, wherein: the outer cylinder body (11) comprises a base (111) and a cylinder body (112) in threaded connection with the base (111), an elastic pin (113) is arranged at the threaded connection position of the base (111) and the cylinder body (112), and a threaded connection portion used for being connected with an external device is arranged at the bottom of the base (111).

5. A cushioning element according to claim 1, wherein: the inner cylinder body assembly (2) further comprises a nylon sleeve (22), a step and an annular groove are arranged on the outer side of the opening end of the inner cylinder body (21), and the nylon sleeve (22) is installed in the annular groove.

6. A cushioning element according to claim 1, wherein: the piston rod assembly (3) further comprises a shaft end check ring (31) and a steel ball (32), the impact head (33) is in threaded connection with the piston rod (34), a stepped hole is formed in the impact head (33), the steel ball (32) is installed at the upper end of the stepped hole, and the shaft end check ring (31) is arranged at the upper end of the stepped hole.

7. A cushioning element according to claim 1, wherein: the inner cylinder end cover assembly (4) comprises an inner cylinder end cover (41) in threaded connection with the inner cylinder (21), and an O-shaped ring (46) is arranged between the inner cylinder end cover (41) and the inner cylinder (21); the inner cylinder body end cover (41) is provided with a stepped hole, a framework-free oil seal (42), a copper bush II (43), a framework oil seal II (45) and a hole retainer ring II (48) are sequentially arranged in the stepped hole from bottom to top, and the framework oil seals II (45) are a group of framework oil seals which are in the same direction and face the direction of the impact head (33); the end cover assembly (4) of the inner cylinder body is connected with the piston rod (34) in a sliding and sealing mode through a framework oil seal II (45), a copper sleeve II (43) and a frameless oil seal (42).

8. A cushioning element according to claim 7, wherein: the inner cylinder body end cover (41) is provided with an elastic daub injection stepped hole, the upper part of the injection stepped hole is provided with a steel ball II (47), the steel ball II (47) is limited in the injection stepped hole by a pin (49), and the lower end of the injection stepped hole is provided with a plug (44).

9. A cushioning member according to any one of claims 1-3 and 5-8, wherein: the lower part of the outer cylinder body (11) is provided with an air hole (18).

10. A power head buffer device is characterized in that: comprising a cushioning element according to any one of claims 1-9.

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