CN216199486U

CN216199486U - Scissor-fork type lifting oil cylinder of overhead working truck

Info

Publication number: CN216199486U
Application number: CN202122612641.0U
Authority: CN
Inventors: 张邦柱; 赵胜
Original assignee: Luzhou Synthetic Hydraulic Parts Co ltd
Current assignee: Luzhou Synthetic Hydraulic Parts Co ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-04-05
Anticipated expiration: 2031-10-28

Abstract

The utility model discloses a scissor-fork type lifting oil cylinder for an overhead working truck, which relates to the technical field of hydraulic oil cylinders and comprises a cylinder body and a guide sleeve arranged at the opening end of the cylinder body, wherein the outer wall of the guide sleeve is in a three-stage step shape, the middle part of the guide sleeve is in threaded connection with the cylinder body, two shoulder shafts of the outer wall of the guide sleeve are respectively provided with a first O-shaped sealing ring and a first L-shaped sealing ring, the first O-shaped sealing ring is positioned on the outer side of the first L-shaped sealing ring, and the inner wall of the cylinder body is also provided with a sealing groove for embedding the first L-shaped sealing ring and a locking inclined plane for locking the first O-shaped sealing ring. The utility model ensures the sealing performance between the guide sleeve and the cylinder body, simultaneously ensures that the guide sleeve is more convenient to install and the lifting oil cylinder is more convenient to assemble and disassemble.

Description

Scissor-fork type lifting oil cylinder of overhead working truck

Technical Field

The utility model relates to the technical field of hydraulic oil cylinders, in particular to a lifting oil cylinder of a scissor-fork type overhead working truck.

Background

With the development of society, the aerial work is everywhere visible, and in order to ensure the safety of workers working at high altitude, aerial work platforms are also appeared, and the types of the aerial work platforms are more and more at present, and the aerial work platforms comprise a scissor-type aerial work platform, a trailer-type aerial work platform, a crank-type aerial work platform, a straight-arm type aerial work platform, an aluminum alloy aerial work platform, a telescopic-cylinder type aerial work platform, a spider-type aerial work platform and the like.

The scissor fork mechanical structure of the scissor fork type aerial work platform enables the lifting platform to be lifted to have higher stability, a wide work platform and higher bearing capacity, enables the aerial work range to be larger, is suitable for simultaneous operation of multiple persons, and is special equipment for aerial work with wide application. The lifting system in the scissor-type aerial work platform comprises a lifting oil cylinder, an upper oil cylinder support, a lower oil cylinder support and the like, but a guide sleeve and a cylinder body in the existing lifting oil cylinder are fixed by screws, and although a sealing ring is arranged between the guide sleeve and the cylinder body, the sealing ring is limited by the pressing force of the guide sleeve or the cylinder body, so that the sealing effect of the sealing ring is greatly reduced, and the sealing property between the guide sleeve and the cylinder body is difficult to ensure.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a scissor-fork type lifting oil cylinder of an aerial work vehicle, which ensures the sealing property between a guide sleeve and a cylinder body, simultaneously ensures that the guide sleeve is more convenient to mount and the lifting oil cylinder is more convenient to assemble and disassemble.

In order to realize the purpose of the utility model, the technical scheme is as follows: the utility model provides a cut fork high altitude construction car lift cylinder, includes the cylinder body and installs the uide bushing at the cylinder body open end, the uide bushing outer wall is tertiary step form, uide bushing middle part and cylinder body threaded connection, and two shoulder shaft punishment of uide bushing outer wall do not install first O type sealing washer, first L type sealing washer, and first O type sealing washer is located first L type sealing washer outside, still has on the cylinder body inner wall to be used for inlaying the seal groove of adorning first L type sealing washer and be used for locking first O type sealing washer locking inclined plane.

Further, the inner wall of the cylinder body is also provided with a transition inclined plane, and the transition inclined plane is positioned on the inner side of the sealing groove.

Furthermore, a second O-shaped sealing ring is embedded on the guide sleeve.

Further, still include the piston rod and with the inside piston that divide into the cylinder body that has the pole chamber and no pole chamber, and the piston is installed on the piston rod, and the piston rod runs through the uide bushing and outwards extends, and still installs seal assembly between piston rod and the uide bushing.

Furthermore, the sealing assembly comprises a second L-shaped sealing ring, a Y-shaped sealing ring and a rectangular sealing ring which are embedded on the inner wall of the guide sleeve, and the small-diameter end of the second L-shaped sealing ring extends towards the outer end of the guide sleeve.

Furthermore, a T-shaped sealing ring is embedded on the outer wall of the piston.

Furthermore, the outer wall of the piston rod is further embedded with a third O-shaped sealing ring which is in sealing fit with the inner wall of the cylinder body.

Furthermore, the piston rod is also provided with an annular groove, steel balls are arranged in the annular groove, the piston is also provided with a threaded hole, and a locking screw for tightly abutting against the steel balls is arranged in the threaded hole.

Furthermore, an installation ring groove is further formed in the outer wall of the piston, a support ring is tightly held in the installation ring groove, and the top of the locking screw is tightly abutted to the support ring.

Furthermore, an oil outlet communicated with the rod cavity and an oil inlet communicated with the rodless cavity are further formed in the cylinder body, and an oil inlet pipe welding piece is further connected to the oil inlet.

Furthermore, bearing seats are arranged on the bottom of the cylinder body and the piston rod.

The beneficial effect of the utility model is that,

the guide sleeve is connected with the cylinder body through the threads, so that the guide sleeve is more convenient to mount, and the lifting oil cylinder is more convenient to assemble and disassemble; meanwhile, the outer wall of the guide sleeve is arranged to be in a three-stage step shape, and the first O-shaped sealing ring and the first L-shaped sealing ring are respectively arranged at the two shoulder shafts of the guide sleeve, so that when the guide sleeve is screwed with the cylinder body, the screwing force of the guide sleeve can extrude the first O-shaped sealing ring and the first L-shaped sealing ring, and the sealing performance between the guide sleeve and the cylinder body is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the principles of the utility model.

FIG. 1 is a schematic structural diagram of a lifting cylinder of a scissor-type aerial work vehicle provided by the utility model;

FIG. 2 is a schematic cross-sectional view of a lift cylinder of a scissor-type aerial lift truck according to the present invention;

fig. 3 is a partially enlarged view of a portion a in fig. 2;

fig. 4 is a partially enlarged view of a portion B in fig. 2.

Reference numbers and corresponding part names in the drawings:

1. the hydraulic cylinder comprises a cylinder body, 2, a piston rod, 3, a rod cavity, 4, a rodless cavity, 5, a piston, 6, a guide sleeve, 7, a first O-shaped sealing ring, 8, a first L-shaped sealing ring, 9, a sealing groove, 10, a locking inclined plane, 11, a transition inclined plane, 12, a second O-shaped sealing ring, 13, a second L-shaped sealing ring, 14, a Y-shaped sealing ring, 15, a rectangular sealing ring, 16, a T-shaped sealing ring, 17, a third O-shaped sealing ring, 18, an annular groove, 19, a steel ball, 20, a threaded hole, 21, a locking screw, 22, an installation annular groove, 23, a support ring, 24, an oil inlet, 25, an oil outlet, 26, an oil inlet pipe welding piece, 27 and a bearing seat.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the utility model. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

In addition, the embodiments of the present invention and the features of the embodiments 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.

As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the lifting oil cylinder of the scissor-type aerial work vehicle provided by the utility model comprises a cylinder body 1, wherein the front end of the cylinder body 1 is open, a guide sleeve 6 is arranged at the front end of the cylinder body 1, and the front end of the cylinder body 1 is the end of a piston rod 2 extending out of the cylinder body 1; the outer wall of the guide sleeve 6 is in a three-stage step shape, namely, the outer wall of the guide sleeve 6 is in a three-stage shaft structure, the outer wall of the guide sleeve 6 is provided with two shoulder shafts, the middle section of the guide shaft is in threaded connection and matching with the cylinder body 1, one shoulder shaft of the guide sleeve 6 is provided with a first O-shaped sealing ring 7, the other shoulder shaft of the guide sleeve 6 is provided with a first L-shaped sealing ring 8, the first O-shaped sealing ring 7 is positioned at the outer side of the first L-shaped sealing ring 8, the inner wall of the cylinder body 1 is also provided with a sealing groove 9 and a locking inclined plane 10, the diameter of the locking inclined plane 10 is gradually reduced from the outer end of the guide sleeve 6 to the inner end of the guide sleeve 6, so that when the first O-shaped sealing ring 7 and the first L-shaped sealing ring 8 are installed, the first O-shaped sealing ring 7 and the first L-shaped sealing ring 8 can be directly sleeved on the two shoulder shafts of the guide sleeve 6 respectively, and the guide sleeve 6 is gradually screwed on the cylinder body 1, the guide sleeve 6 drives the first O-shaped sealing ring 7 and the first L-shaped sealing ring 8 to synchronously advance, make first O type sealing washer 7 compress tightly to locking inclined plane 10 gradually, first L type sealing washer 8 compresses tightly to seal groove 9 gradually, makes uide bushing 6 screw up to fix on cylinder body 1 simultaneously, and first O type sealing washer 7 compresses tightly with first L type sealing washer 8 and installs between uide bushing 6 and cylinder body 1 to guarantee the leakproofness between uide bushing 6 and cylinder body 1, made the sealed effect between uide bushing 6 and the cylinder body 1 obtain guaranteeing.

In some embodiments, the inner wall of the cylinder body 1 further has a transition inclined plane 11, the inclined direction of the transition inclined plane 11 is consistent with the inclined direction of the locking inclined plane 10, the outer end of the transition inclined plane 11 is connected with the sealing groove 9, and the maximum diameter of the transition inclined plane 11 is smaller than the diameter of the shoulder shaft in the middle of the guide sleeve 6, so that the first L-shaped sealing ring 8 is pressed in the sealing groove 9, the first L-shaped sealing ring 8 is pressed between the shoulder shaft of the guide sleeve 6 and the groove wall of the sealing groove 9, and the inner diameter of the first L-shaped sealing ring 8 is deformed by the avoidance of the transition inclined plane 11, so that the part of the first sealing ring pressed by the guide sleeve 6 is better attached to the outer wall of the guide sleeve 6 and the groove wall of the sealing groove 9, and the sealing effect between the guide sleeve 6 and the cylinder body 1 is greatly improved.

In some embodiments, a second O-ring 12 is further embedded on the guide sleeve 6, and the second O-ring 12 is located inside the first L-ring 8, so that the inner end of the guide sleeve 6 and the cylinder 1 can be primarily sealed by the second O-ring 12, and the sealing effect between the guide sleeve 6 and the cylinder 1 is better; meanwhile, as the second O-shaped sealing ring 12 is embedded on the guide sleeve 6, the second O-shaped sealing ring 12 only needs to be sleeved on the guide sleeve 6 before the guide sleeve 6 is screwed and fixed on the cylinder body 1 when being installed, so that the installation of the second O-shaped sealing ring 12 is more convenient.

In some embodiments, the scissor-type aerial work vehicle lifting oil cylinder further comprises a piston rod 2 and a piston 5, the central axis of a cylinder body 1 and the central axis of the piston rod 2 are on the same straight line, the piston 5 is in sliding sealing fit with the cylinder body 1, the piston 5 divides the cylinder body 1 into two chambers, and the piston 5 and one end of the piston rod 2 are fixed, so that after the piston 5 is installed in the cylinder body 1, the two chambers divided by the piston 5 in the cylinder body 1 are respectively a rod-containing chamber 3 and a rod-free chamber 4, wherein the rod-containing chamber 3 is a chamber with the piston rod 2, and the rod-free chamber 4 is a chamber without the piston rod 2. The front end of the piston rod 2 penetrates through the guide sleeve 6 and extends outwards, the piston rod 2 can move back and forth relative to the guide sleeve 6, a sealing assembly is further installed between the piston rod 2 and the guide sleeve 6, the sealing performance between the piston rod 2 and the guide sleeve 6 is guaranteed, and hydraulic oil in the cylinder body 1 is effectively prevented from leaking between the piston rod 2 and the guide sleeve 6.

In some embodiments, the sealing assembly includes a second L-shaped sealing ring 13, a Y-shaped sealing ring 14 and a rectangular sealing ring 15 which are embedded in the inner wall of the guide sleeve 6, wherein at least one of the second L-shaped sealing ring 13, the Y-shaped sealing ring 14 and the rectangular sealing ring 15 is arranged in sequence from the outer end of the guide sleeve 6 to the inner end of the guide sleeve 6, and the sealing effect between the piston rod 2 and the guide sleeve 6 is greatly improved by the cooperation of the second L-shaped sealing ring 13, the Y-shaped sealing ring 14 and the rectangular sealing ring 15; the small-diameter end of the second L-shaped sealing ring 13 extends towards the outer end of the guide sleeve 6, so that when the piston rod 2 extends outwards, a limit spigot is formed at the step of the second L-shaped sealing ring 13, the second L-shaped sealing ring 13 is effectively prevented from falling off due to inertia when the piston rod 2 extends outwards, and the second L-shaped sealing ring 13 is more stably installed; meanwhile, the opening of the Y-shaped sealing ring 14 faces the middle part of the cylinder body 1, so that when the piston rod 2 extends outwards, the Y-shaped sealing ring 14 can be driven to open in the process that the piston rod 2 extends outwards, the sealing effect between the Y-shaped sealing ring 14 and the piston rod 2 is better, and the sealing effect between the guide sleeve 6 and the piston rod 2 is better.

In some embodiments, a T-shaped sealing ring 16 is further embedded in the outer wall of the piston 5, and the width of the outer side of the T-shaped sealing ring 16 is greater than the width of the inner side of the T-shaped sealing ring 16, so that the adhering area between the T-shaped sealing ring 16 and the inner wall of the cylinder 1 is larger, the sealing area between the cylinder 1 and the piston 5 is larger, the sealing effect between the piston 5 and the cylinder 1 is better, and the sealing performance between the piston 5 and the cylinder 1 is ensured.

In some embodiments, the outer wall of the piston rod 2 is further embedded with a third O-ring 17 which is in sealing fit with the inner wall of the cylinder body 1, specifically, the outer wall of the piston rod 2 can be provided with an embedded groove, the third O-ring 17 is installed in the embedded groove, after the piston 5 is installed on the piston rod 2, the piston rod 2 and the piston 5 are effectively sealed through the third O-ring 17, so that the sealing performance between the piston rod 2 and the piston 5 is ensured, the isolation effect between the rod cavity 3 and the rodless cavity 4 is better, the hydraulic oil pressure in the rod cavity 3 and the rodless cavity 4 of the lifting oil cylinder is more stable in the using process, and the lifting oil cylinder is more stable in use.

In some embodiments, the piston rod 2 is further provided with an annular groove 18, steel balls 19 are installed in the annular groove 18, the depth of the annular groove 18 is smaller than the radius of the steel balls 19, a plurality of steel balls 19 can be arranged in the annular groove 18, and the plurality of steel balls 19 can be uniformly arranged at intervals along the circumferential direction of the annular groove 18; meanwhile, the piston 5 is further provided with a threaded hole 20 corresponding to the steel ball 19 in position, the top of the steel ball 19 is located in the threaded hole 20, the threaded hole 20 is internally screwed with a locking screw 21, the lower end of the locking screw 21 is abutted against the steel ball 19, so that the steel ball 19 is abutted between the annular groove 18 and the piston 5, the steel ball 19 is in point contact with the locking screw, and the top of the steel ball 19 is located in the threaded hole 20. Through the cooperation of steel ball 19 and ring channel 18, make piston rod 2 rotate for piston 5, but piston 5 is locked with piston rod 2 axial displacement, and when piston rod 2 received the power of torsion direction, piston rod 2 then can rotate for piston 5, effectively avoids piston rod 2 to receive the power of torsion direction and splits, makes piston rod 2's life longer.

In some embodiments, the outer wall of the piston 5 is further provided with a mounting ring groove 22, the locking screws 21 are located at the bottom of the mounting ring groove 22, the mounting ring groove 22 is internally provided with a support ring 23 in a holding manner, and the upper ends of the locking screws 21 are abutted against the support ring 23, so that one support ring 23 can simultaneously hold a plurality of locking screws 21 in the threaded hole 20 in a holding manner, the screws are more stably mounted, and the locking screws 21 are effectively prevented from falling off from the threaded hole 20.

In some embodiments, the cylinder body 1 is further provided with an oil inlet 24 and an oil outlet 25, the oil inlet 24 is communicated with the interior of the rodless cavity 4, the oil outlet 25 is communicated with the interior of the rod cavity 3, the oil inlet 24 is close to the bottom of the cylinder body 1, the oil outlet 25 is close to the inner end of the guide sleeve 6, in order to avoid the oil inlet 24 or the oil outlet 25 from being blocked during the reciprocating motion of the piston rod 2 in the cylinder body 1, the rear end of the piston rod 2 can slightly extend out of the piston 5, so that the rear end of the piston rod 2 contacts the bottom of the cylinder body 1 first during the motion of the piston rod 2 towards the bottom of the cylinder body 1, a certain distance is formed between the piston 5 and the bottom of the cylinder body 1, the oil inlet 24 is effectively prevented from being blocked, meanwhile, the inner end of the guide sleeve 6 can be provided with a circular cut notch, so that a certain gap is formed between the inner end of the guide sleeve 6 and the cylinder body 1, the oil outlet 25 corresponds to the circular cut notch, so that when the piston 5 moves towards the guide sleeve 6, even if the piston 5 is abutted against the inner end of the guide sleeve 6, the oil outlet 25 is not blocked. Hydraulic oil in the rodless cavity 4 can enter or be discharged from the oil inlet 24, hydraulic oil in the rod cavity 3 can be fed or discharged from the oil outlet 25, and the piston 5 reciprocates in the cylinder body 1 due to the difference of oil pressure of the hydraulic oil in the rodless cavity 4 and the hydraulic oil in the rod cavity 3, so that the piston rod 2 extends out of the cylinder body 1 or is retracted into the cylinder body 1 along the guide sleeve 6; meanwhile, the oil inlet 24 is also connected with an oil inlet pipe welding piece 26.

In some embodiments, the bottom of the cylinder 1 and the piston rod 2 are provided with bearing seats 27, so that the installation and connection of the present invention are more convenient.

When the hydraulic cylinder is used, when the piston rod 2 needs to extend out of the cylinder body 1, hydraulic oil is input into the rodless cavity 4 through the oil inlet 24 by the oil inlet pipe welding part 26, so that the pressure intensity in the rodless cavity 4 is greater than that in the rod cavity 3, the hydraulic oil in the rodless cavity 4 pushes the piston 5 to move towards the guide sleeve 6, and the piston 5 drives the piston rod 2 to synchronously move while moving, so that the piston rod 2 extends out of the cylinder body 1; when the piston rod 2 needs to be retracted into the cylinder body 1, hydraulic oil is input into the rod cavity 3 through the oil outlet 25, the input of the hydraulic oil into the rodless cavity 4 through the oil inlet 24 is stopped, the pressure intensity in the rod cavity 3 is larger than that in the rodless cavity 4 along with the fact that the hydraulic oil enters the rod cavity 3, the hydraulic oil in the rod cavity 3 pushes or the piston 5 moves towards the bottom of the cylinder body 1, and the piston 5 drives the piston rod 2 to synchronously move while moving, so that the piston rod 2 is retracted into the cylinder body 1.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of description and are not intended to limit the scope of the utility model. Other variations or modifications will occur to those skilled in the art based on the foregoing disclosure and are within the scope of the utility model.

Claims

1. A scissor-type lifting oil cylinder of an aerial work platform is characterized by comprising a cylinder body (1) and a guide sleeve (6) arranged at the opening end of the cylinder body (1); the outer wall of the guide sleeve (6) is in a three-level step shape, the middle of the guide sleeve (6) is in threaded connection with the cylinder body (1), two shoulder shafts of the outer wall of the guide sleeve (6) are respectively provided with a first O-shaped sealing ring (7) and a first L-shaped sealing ring (8), the first O-shaped sealing ring (7) is located on the outer side of the first L-shaped sealing ring (8), and the inner wall of the cylinder body (1) is further provided with a sealing groove (9) for embedding the first L-shaped sealing ring (8) and a locking inclined plane (10) for locking the first O-shaped sealing ring (7).

2. A scissor type aerial lift truck lifting cylinder according to claim 1, wherein the inner wall of the cylinder body (1) is further provided with a transition inclined surface (11), and the transition inclined surface (11) is located on the inner side of the sealing groove (9).

3. A scissor-type aerial lift cylinder for a vehicle as claimed in claim 1, wherein the guide sleeve (6) is further fitted with a second O-ring (12).

4. A scissor type aerial work platform lifting oil cylinder according to claim 1, further comprising a piston rod (2) and a piston (5) dividing the interior of the cylinder body (1) into a rod cavity (3) and a rodless cavity (4), wherein the piston (5) is installed on the piston rod (2), the piston rod (2) penetrates through the guide sleeve (6) to extend outwards, and a sealing assembly is further installed between the piston rod (2) and the guide sleeve (6).

5. A scissor type aerial lift cylinder of claim 4, wherein the sealing assembly comprises a second L-shaped sealing ring (13), a Y-shaped sealing ring (14) and a rectangular sealing ring (15) which are embedded in the inner wall of the guide sleeve (6), and the small diameter end of the second L-shaped sealing ring (13) extends towards the outer end of the guide sleeve (6).

6. A scissor type aerial lift cylinder of claim 4, wherein the outer wall of the piston (5) is embedded with a T-shaped sealing ring (16).

7. A scissor type aerial work platform lifting oil cylinder according to claim 4, wherein a third O-shaped sealing ring (17) which is in sealing fit with the inner wall of the cylinder body (1) is further embedded in the outer wall of the piston rod (2).

8. A scissor type aerial work platform lifting oil cylinder according to claim 4, wherein the piston rod (2) is further provided with an annular groove (18), a steel ball (19) is installed in the annular groove (18), the piston (5) is further provided with a threaded hole (20), and a locking screw (21) which abuts against the steel ball (19) is installed in the threaded hole (20).

9. The scissor type aerial work platform lifting oil cylinder of claim 8, wherein the outer wall of the piston (5) is further provided with an installation ring groove (22), a support ring (23) is tightly held in the installation ring groove (22), and the top of the locking screw (21) is tightly propped against the support ring (23).

10. A scissor type aerial work platform lifting cylinder according to any one of claims 1 to 9, wherein the cylinder body (1) is further provided with an oil outlet (25) communicated with the rod chamber (3) and an oil inlet (24) communicated with the rodless chamber (4), and the oil inlet (24) is further connected with an oil inlet pipe welding part (26).