CN213505484U

CN213505484U - Pre-tightening buffer and roller cage shoe

Info

Publication number: CN213505484U
Application number: CN202022362811.XU
Authority: CN
Inventors: 杨建奎; 袁冬; 吴军; 武云强
Original assignee: Shandong Nuotai Electrical Equipment Co ltd
Current assignee: Shandong Nuotai Electrical Equipment Co ltd
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-06-22
Anticipated expiration: 2030-10-22

Abstract

The utility model discloses a pretension formula buffer and gyro wheel cage shoe the utility model discloses an in the embodiment, in the cylinder of buffer, construct the pneumatic cylinder in the one end of dish spring group, through the liquid volume that the adjustment fills, can organize the adjustment that carries out the pre-compaction volume to dish spring. When the disc spring group is aged to a certain degree, the prepressing amount can be further adjusted, so that the buffer keeps a better working state.

Description

Pre-tightening buffer and roller cage shoe

Technical Field

The utility model relates to a pretension formula buffer, the utility model discloses still relate to a gyro wheel cage shoe that is furnished with this pretension formula buffer.

Background

The current roller cage shoe mainly executes a coal mine industry standard MT236-2011 'rectangular steel cage guide roller cage shoe', and the current roller cage shoe comprises a base used for installing the roller cage shoe on a cage, an approximately L-shaped swinging arm is installed on the base through a first pin shaft, and the swinging arm is used as the base of a roller and used for installing the roller. When the gyro wheel received the impact, the pendulum pivoted arm can produce the swing, consequently, the one end of keeping away from the base at the pendulum pivoted arm articulates there is a buffer, and the seat end of buffer is installed on the base through the second round pin axle, and the buffer is used for producing the buffering when the pendulum pivoted arm swings.

Chinese patent document CN2374531Y discloses a roller, which is a roller cage shoe in essence, and belongs to the early roller cage shoe. The damper used in this patent document belongs to the most commonly used damper with a disc spring as a damping member. The buffer in this patent document has a pair of cylindrical shells, the bottom of the outer shell is on top and has a through hole, the bottom of the inner shell is on the bottom, and the inner shell is installed in the outer shell through a threaded connection, and a set of disc springs is arranged in the formed inner cavity. And a part of the guide rod, which penetrates out of the through hole, is provided with a hanging hole, the upper end of the part of the guide rod, which is positioned in the barrel, is provided with a disk-shaped structure pressed on the disk spring, the guide rod is guided by the through hole, the lower end of the inner shell is also provided with a nut which is used for limiting the disk spring from the lower part and is provided with a central hole for adjusting the pretightening force of the disk spring, and the lower end of the guide rod is guided in the central hole. In the structure, a plurality of threads exist, particularly, the inner shell and the outer shell are in threaded connection, the shells are large, the whole disassembly is difficult, the pre-pressure for restraining the disc spring is determined, and the pre-pressure of the disc spring cannot be adjusted.

Chinese patent document CN2873720Y discloses a buffer developed from the buffer disclosed in chinese patent document CN2374531Y, which is improved by omitting a housing and having a length adjustment pin, and the length of the buffer as a whole is adjustable. Specifically, the barrel is provided with a barrel bottom arranged on the upper part and a through hole arranged on the barrel bottom, the lower end of the barrel is provided with an internal thread used for connecting a connecting seat, a group of disc springs are arranged in the space in the barrel between the connecting seat and the barrel bottom, a sliding rod extends out of the barrel through the through hole, and a boss pressed on the upper end of the disc spring group is arranged on the part in the barrel. Due to the lack of the locking structure, the length of the thread for connecting the connecting seat and the cylinder is longer, and the disassembly is relatively difficult. Meanwhile, the patent document also lacks a structure for adjusting the pre-pressure of the disc spring, and the adaptability is relatively poor.

Chinese patent document CN204714281U discloses a damper, which has a cylinder with a closed lower end, an internal thread at the upper end of the cylinder, and an end cap with an external thread and a guide hole, wherein the end cap is connected to the upper end of the cylinder through the thread, and a set of disc springs are installed in a space defined by the end cap and the bottom of the cylinder. The damper further has a connecting rod having a sliding section guided to the guide hole, and a collar at an upper end of a portion of the sliding section located in the cylinder for supporting on an upper end of the disc spring. Similarly, regarding the disc spring, this patent document also does not provide a member for adjusting the pre-pressure of the disc spring.

In summary, the existing buffer provided with the roller cage shoe generally does not have a part or structure for adjusting the pre-pressure of the disc spring, and after the disc spring is used for a long time, the stiffness coefficient changes, so that the buffer performance of the buffer is reduced, the roller swings to a large extent in the running process, and the running stability of the cage is influenced.

Disclosure of Invention

In view of the present pretension to dish spring in the buffer generally is fixed pretension, and leads to the relatively poor problem of buffer maintainability, the utility model provides a can carry out the pretension formula buffer of adjustment to dish spring pretightning force. The utility model also provides a gyro wheel cage shoe that is furnished with this pretension formula buffer.

In an embodiment of the present invention, a pre-tightening buffer is provided, including:

the cylinder barrel is a cylinder and is provided with a first end and a second end opposite to the first end;

the seal cover is arranged at the first end of the cylinder barrel, is provided with an oil filling hole and is provided with a first hinge shaft sleeve;

the piston is arranged in the cylinder barrel and matched with the cylinder barrel to form a hydraulic piston, and an adjusting oil cavity for injecting oil through the oil injection hole is formed between the piston and the sealing cover;

the one-way valve is arranged on the oil filling hole and provides a one-way oil filling passage;

the end cover is provided with a central hole, is arranged at the second end of the cylinder barrel through a detachable connection structure, and forms a buffer space with the piston;

the spring seat is a rod piece which is provided with a middle flange and is coaxial with the cylinder barrel, the rod piece is provided with two parts based on the middle flange, the first part and the middle flange of the two parts are positioned in the buffer space, and the second part penetrates out of the central hole and is provided with a second hinge shaft sleeve;

the disc spring group takes the first part as a spring guide post and is supported between the piston and the end cover.

Optionally, the sealing cover is provided with an exhaust hole;

the air vent or the screw plug is arranged in the air vent.

Optionally, the check valve is a built-in check valve built in the oil filling hole, and the oil filling hole part positioned outside the built-in check valve forms an oil filling opening; or the outer end of the one-way valve after the one-way valve is arranged on the oil filling hole forms an oil filling port;

the oil filling opening is provided with internal threads;

and providing a screw plug matched with the internal thread to close the oil filling opening.

The preload buffer as claimed in claim 3, wherein the oil injection port is located at a side surface of the cap;

the plug screw is a hexagon socket head cap screw.

Optionally, a circular groove communicated with the oil filling hole is formed in one side, opposite to the piston, of the sealing cover.

Optionally, the piston is provided with a yielding groove at a position opposite to the first part so as to avoid motion interference between the piston and the first part in the spring seat working stroke.

Optionally, the cover is welded to the cylinder.

Alternatively, the end cap is a round nut with an external thread, and correspondingly the second end of the cylinder has an internal thread, by means of which the end cap is connected with the cylinder.

Optionally, the spring seat is a pipe fitting, and a smooth hole section located on the piston side and a threaded hole section located on the second hinge shaft sleeve side are arranged in the spring seat;

the second hinge shaft seat is positioned at one end of a screw rod, and the screw rod is matched with the threaded hole section and is arranged on the spring seat.

The utility model also provides a gyro wheel cage shoe that is furnished with aforementioned pre-compaction formula buffer.

The utility model discloses an in the embodiment, in the cylinder of buffer, construct the pneumatic cylinder in the one end of dish spring group, through the adjustment liquid volume that fills, can carry out the adjustment of pre-compaction volume to dish spring group. When the disc spring group is aged to a certain degree, the prepressing amount can be further adjusted, so that the buffer keeps a better working state.

Drawings

FIG. 1 is a schematic cross-sectional view of a bumper according to an embodiment.

In the figure: 1. the piston comprises a lower hinged shaft sleeve, 2 parts of a bush, 3 parts of a locking nut, 4 parts of a screw rod, 5 parts of an adjusting nut, 6 parts of a flange, 7 parts of a spring seat, 8 parts of a disc spring group, 9 parts of a cylinder barrel, 10 parts of a welding line, 11 parts of a sealing cover, 12 parts of an exhaust hole, 13 parts of an inner hexagonal plug, 14 parts of a sealing ring, 15 parts of an upper hinged shaft sleeve, 16 parts of a bush, 17 parts of an oil filling hole, 18 parts of a built-in check valve, 19 parts of a sealing ring, 20 parts of an inner hexagonal plug, 21 parts of a piston, 22 parts of a piston sealing ring, 23 parts of a piston support ring, 24 parts of.

Detailed Description

In the embodiment of the present invention, the structure of the buffer is described in the state shown in fig. 1, and the basic reference system is determined in the upper and lower directions in the drawing, which does not mean that the buffer is inevitably installed in the upper and lower directions.

It should be noted that, in the embodiment of the present invention, the buffer is improved, and the assembly manner of the buffer on the roller cage shoe is not changed due to the improvement, therefore, in the embodiment of the present invention, the structure and principle of the pre-pressing buffer are mainly introduced, and for the roller cage shoe to which the pre-pressing buffer is applied, reference may be made to the background art section, and the aforementioned coal mine industry standard MT236-2011 "rectangular steel cage guide roller cage shoe".

In most applications, the disc spring assembly 8 in the damper needs a certain amount of preload, which is relatively fixed by the way it is assembled. In the case where the adjustment nut 5 shown in fig. 1 is disposed, the preload amount can be adjusted slightly, but this adjustment method causes the locking state of the adjustment nut 5 to be unreliable, and it is understood that the state after the adjustment nut 5 is screwed in place tends to have the largest bonding force.

It will be appreciated that the compressibility is very low for liquids, similar to solids, in other words, in the configuration shown in figure 1, the position of the piston 21 can be controlled by adjusting the charge of liquid, thereby adjusting the pre-compression of the disc spring pack 8.

One drawback to the use of hydraulic systems is leakage, which is essentially negligible, as the vent hole 12 and the oil hole 17 are both sealed in a static manner. For the piston 21, which is substantially in a static state, a relatively reliable seal is easy to achieve despite fluctuations in the magnitude of the force applied.

In general, the preload of the disc spring group 8 is determined by the screwing depth between the adjusting nut 5 and the cylinder 9 as shown in fig. 1, and is generally a design amount, in other words, the preload of the disc spring group 8 when the adjusting nut 5 is screwed into the dead point position of the cylinder 9, which is a design amount and is often not adjustable.

The cylinder 9 is an inherent configuration of a pre-stressed bumper, and the cylinder 9 is generally of a cylindrical configuration in structural terms, at least one end of which is openable to facilitate later maintenance, such as replacement of a disc spring.

For convenience of description, one end of the cylinder is referred to as a first end, and an end opposite to the first end is referred to as a second end. In fig. 1, the end where the adjusting nut 5 is located is the second end, and the end where the cover 11 is located is the first end. And in the reference frame shown in fig. 1, the first end is an upper end and the second end is a lower end.

In the structure shown in fig. 1, the cover 11 is preferably formed as a separate member in consideration of, for example, machining of the exhaust hole 12 and the oil hole 17, and therefore, it is necessary to consider the connection between the cover 11 and the cylinder 9, and in fig. 1, the cover 11 and the cylinder 9 are welded to form the weld 10, which is relatively reliable and does not cause a problem of connection sealing.

In some embodiments, the cover 11 and the cylinder 9 may be formed together, and the cylinder 9 and the cover 11 are integrally formed.

The cover 11 is provided with an upper hinge bush 15 in fig. 1 for hinging with, for example, a swing arm, the upper hinge bush 15 is provided with a bush 16, and the bush 16 can be a copper bush to improve the wear resistance.

The upper hinge sleeve 15 may be integrally formed with the cover 11, or may be separately formed and then integrally connected by welding.

In addition, it is necessary to ensure that the axes of the upper hinge bush 15 and the lower hinge bush 1 are parallel to each other in fig. 1, which is common knowledge in the art and will not be described in detail herein.

In contrast to conventional pre-stressed dampers, fig. 1 shows a piston 21, which piston 21 is arranged in the upper part of the cylinder 9 of fig. 1, i.e. at the end where the cover 11 is located, i.e. at the aforementioned first end.

The piston 21 is provided so as to be able to form a sliding pair in cooperation with the cylinder 9, and the piston 21 constitutes a hydraulic piston.

Accordingly, an adjustment oil chamber filled with oil via the oil hole 17 is formed between the piston 21 and the cover 11, and the maximum space of the adjustment oil chamber determines the adjustment capability of the disc spring group 8.

Because a certain pre-pressure is generated after the disc spring group 8 is installed in place, in order to further adjust the disc spring group 8, the hydraulic pressure needs to overcome the pre-pressure, and the friction force between the piston 21 and the cylinder 9 can push the piston 21 to apply further pressure to the disc spring group 8, under this condition, hydraulic oil needs to have a certain oil injection pressure, in order to avoid oil return after removing an oil gun, for example, a check valve is installed on the oil injection hole 17, and the convenience of oil return stopping is improved while the oil injection amount is accurately controlled.

The cylinder cover below the cylinder barrel 9 is marked as an end cover, a detachable connection structure is adopted between the cylinder cover and the cylinder barrel 9, the end cover adopts an adjusting nut 5 in the figure 1, the adjusting nut and the cylinder barrel 9 are connected through threads, and the cylinder cover is relatively convenient to disassemble and assemble.

The end cap has a central hole that serves as a via for the output of the cushioning properties of the spring seat 7 in fig. 1.

Correspondingly, the end cover is used for sealing the lower end of the cylinder 9, the space between the end cover and the piston 21 is used for installing the buffer element, namely the disc spring group 8 and the spring seat 7 attached to the disc spring group, and the space between the end cover and the piston 21 is used as the buffer space.

For the spring seat 7, a spring guide post is provided to support the lower end of the disc spring assembly 8 in fig. 1, and the disc spring assembly 8 is sleeved on the spring guide post to prevent the disc spring assembly 8 from being unstable. Wherein the part for supporting the disc spring assembly 8 is a middle flange located in the middle of the spring seat 7, i.e. the flange 6 shown in fig. 1.

In addition to supporting the lower end of the disc spring assembly 8, the flange 6 is also the subject of restraint of the downward stop of the disc spring assembly 8, and the part of the restraint flange 6 is the adjusting nut 5 shown in fig. 1. According to the structure, the spring seat 7 is divided into two parts by the flange 6, wherein the part positioned in the cylinder 9 comprises the spring guide column and the flange 6, the spring guide column part is marked as a first part, the part penetrating through the central hole is marked as a second part, and the second part can form shaft hole matching with the central hole, so that certain guiding capacity is achieved.

Accordingly, the axis of the spring seat 7 is collinear with the axis of the cylinder 9.

The damper has two hinge bushes, and in addition to the aforementioned upper hinge bush 15, there is a lower hinge bush 1 as shown in fig. 1, the lower hinge bush 1 being mounted on the spring mount 7 for articulation between the damper and the roller shoe base.

In the embodiment of the present invention, the disc spring set 8 is supported between the piston 21 and the end cover, when the force applied to the buffer is large, the flange 6 presses the disc spring set 8 to compress the disc spring set, when the force applied to the buffer is small, the disc spring set 8 recovers its deformation, and the flange 6 is pushed to the adjusting nut 5 as shown in fig. 1.

When used for a long time, the stiffness coefficient of the disc spring group 8 decreases and the initial supporting capacity of the disc spring group 8 decreases, and for this purpose, the pre-pressure of the disc spring group 8 is increased by lowering the piston 21 by injecting a given amount of hydraulic oil through the oil injection hole 17 as shown in fig. 1.

Regarding the oil filling into the gallery, it is not necessary to consider whether or not the gallery is filled, that is, to consider the influence of the residual air in the gallery, and therefore, in some embodiments, only the oil filling hole 17 may be provided so as to be adapted to the gallery.

Although the compressibility of air is good, the presence of residual air increases the noise of the buffer during operation, and in view of this, in a preferred embodiment, the problem of filling of the hydraulic oil in the adjustment oil chamber needs to be taken into account. In fig. 1, an exhaust hole 12 is opened on the sealing cover 11, and accordingly, a release valve or a screw plug is provided to be fitted to the exhaust hole 12.

Based on the upper part and the lower part shown in fig. 1, the exhaust hole 12 is vertically opened on the sealing cover 11, the axis of the exhaust hole 12 is coincident with or parallel to the cylinder barrel 9, in the initial stage of filling hydraulic oil, the inner hexagonal screw plug 13 shown in fig. 1 can be opened until the hydraulic oil is about to overflow, the exhaust hole 12 is sealed by the inner hexagonal screw plug 13, and the hydraulic oil is continuously filled until the pre-pressure on the disc spring group 8 reaches the design requirement.

In order to reduce possible movement interference and space occupation, the one-way valve is a built-in one-way valve 18 which is arranged in the oil filling hole 17 and is accommodated in the oil filling hole 17, so that the external structure body of the buffer cannot be increased, and the possible movement interference and space occupation are reduced.

In some embodiments, the portion of the oil filler hole located outside the built-in check valve 18 constitutes the oil filler opening; in other embodiments the filling opening may be provided directly by a non-return valve, the outer end of which, correspondingly, after the non-return valve has been mounted on the filling opening, constitutes the filling opening.

Preferably, the oil filling opening is provided with an internal thread; a plug screw is provided to be fitted to the female screw to close the oil filler hole, thereby improving the stopping ability of the oil filler hole 17 and preventing leakage of hydraulic oil.

In fig. 1, the socket head 13 and the socket head 20 are respectively provided with a sealing ring 14 and a sealing ring 19 to improve the overall sealing capability.

Accordingly, the hexagon socket head 13 and the hexagon socket head 20 are formed by pipe threads.

In some embodiments, the oil filling port is located on the side of the cap 11 to facilitate the oil filling operation.

It can be seen in fig. 1 that the side of the cover 11 opposite the piston 21 is grooved with a circular groove communicating with said oil holes to provide an initial relatively large hydraulic interface to avoid the piston 21 from being in a dead-stop condition. Or, if there is no circular groove, the hydraulic pressure initially applied to the piston 21 is directly related to the outlet area of the oil hole 17, obviously, the oil hole 17 should not be too large, and if a circular groove is used, the circular groove can still provide a large area when the piston 21 is attached to the cover 11, thereby facilitating the detachment of the piston 21 from the attachment to the cover 11.

In fig. 1, there is a relief groove 24 mainly used to avoid the interference of movement, specifically, the position of the piston 21 opposite to the first part, that is, the position opposite to the spring guide post on the spring seat 7, is provided with the relief groove 24, when the disc spring is compressed, the spring guide post partially protrudes into the relief groove 24, rather than directly generating rigid impact with the piston 21.

If the groove 24 of stepping down is not set up, the spring guide pillar can be shorter relatively, still can satisfy the operation requirement, lie in that dish spring self is the ring shape, and its periphery receives the restraint of cylinder 9 wall, and the condition of unstability is difficult relatively takes place under the compression state, and the spring guide pillar is shorter, and is not very big to the operating condition influence of dish spring group 8.

As for the connection between the end cover and the cylinder tube 9, as described above, a detachable connection structure is required to improve maintainability. Fig. 1 shows a relatively typical connection, in which a round nut, i.e. the adjusting nut 5 shown in fig. 1, is formed, and correspondingly, the second end, i.e. the lower end in fig. 1, of the cylinder 9 is internally threaded, and the adjusting nut 5 is in threaded connection with the cylinder 9.

In some embodiments, the second end of the cylinder 9 is provided with a counter bore, the end cap is just embedded into the counter bore, the side of the counter bore is provided with a set screw hole, and the end cap is locked by the set screw.

Similarly, if the end cap is inserted into the counterbore, the side of the end cap may be grooved or holed, and the side of the counterbore may be provided with pin holes opposite to the grooves or holes in the end cap, and the end cap may be locked by the stop pins.

In some embodiments, the spring seat 7 is a pipe to reduce its weight.

The spring seat 7 is internally provided with a unthreaded hole section 25 positioned on the piston side and a threaded hole section positioned on the second hinge shaft sleeve side; the second hinge shaft seat is positioned at one end of a screw rod 4, and the screw rod 4 is matched with the threaded hole section and is arranged on the spring seat 7.

The threaded connection between the threaded rod 4 and the spring seat 7 is not only suitable for assembly, but can also be used to adjust the overall length of the damper.

After the screw 4 is adjusted in place, it is locked using a locking nut 3 as shown in fig. 1.

Claims

1. A pre-tensioned buffer comprising:

2. The pre-tensioned buffer recited in claim 1 wherein the cover has a vent hole;

the air vent or the screw plug is arranged in the air vent.

3. The pre-tensioned buffer according to claim 1 or 2, wherein the check valve is a built-in check valve built in the oil filling hole, and a part of the oil filling hole located outside the built-in check valve constitutes the oil filling port; or the outer end of the one-way valve after the one-way valve is arranged on the oil filling hole forms an oil filling port;

the oil filling opening is provided with internal threads;

4. The preload buffer as claimed in claim 3, wherein the oil injection port is located at a side surface of the cap;

the plug screw is a hexagon socket head cap screw.

5. The preload absorber as claimed in claim 1, wherein a circular groove communicating with said oil filler hole is formed at a side of the cap opposite to the piston.

6. The pre-tensioned buffer of claim 1 wherein the piston is relieved from the first portion to prevent interference between the piston and the first portion during the spring seat stroke.

7. The pre-tensioned buffer of claim 1 wherein the cover is welded to the cylinder.

8. The pre-tensioned buffer of claim 1 wherein the end cap is a round nut having an external thread and correspondingly the second end of the cylinder has an internal thread through which the end cap is connected to the cylinder.

9. The pre-tensioned buffer according to claim 1 wherein the spring seat is a tubular member and has a smooth bore section in the spring seat on the piston side and a threaded bore section in the spring seat on the second hinge sleeve side;

10. A roller shoe fitted with a pre-tensioned buffer as claimed in any one of claims 1 to 9.