CN221103129U - Gear rack electric cylinder for crane - Google Patents

Abstract

The utility model relates to the field of electric cylinders, in particular to a gear rack electric cylinder for a crane. The rack and pinion electric cylinder for a crane comprises: the device comprises a cylinder barrel, a piston rod, a gear shaft and at least two groups of driving components; the piston rod is provided with a rack section extending along the axial direction; the main body part of the piston rod is arranged inside the cylinder barrel in an axial sliding way; the driving assembly comprises a driving motor and a reduction gearbox; the driving motor is in transmission connection with the reduction gearbox; the output end of the reduction gearbox is in transmission connection with the gear shaft; the gear is in transmission connection with the gear shaft, the gear is meshed with the rack section, and the gear is rotatably fixed with the cylinder barrel through the gear shaft so as to drive the piston rod to move along the axial direction of the cylinder barrel. The large-load and large-stroke electric cylinder of the crane is compact in structure and low in cost, and the working states of all driving components can be adjusted according to the load condition, so that the efficient action of the gear rack electric cylinder is synchronously realized, and the energy consumption is saved.

Description

Gear rack electric cylinder for crane

Technical Field

The utility model relates to the field of electric cylinders, in particular to a gear rack electric cylinder for a crane.

Background

The electric cylinder is generally composed of a linear actuator, a transmission mechanism and a motor, has the characteristics of low noise and no leakage, replaces the traditional hydraulic oil cylinder in many occasions, and has wider and wider application in industry. The conventional electric cylinder adopts a single motor to drive a gear reduction or a synchronous belt, and a synchronous chain to reduce speed to drive a ball screw to control the expansion and contraction of a cylinder barrel, and the structure is generally used under a small load working condition. The synchronous belt and the synchronous chain have low bearing capacity, reduced transmission efficiency and short service life, and are only suitable for low-end equipment with light load, low control precision requirement and short movement stroke. For a large-load large-stroke high-precision electric cylinder, a single-motor driving gear speed reduction, synchronous belt or synchronous chain structure cannot meet the use requirements, and the structure is large in size and high in cost.

The electric cylinder for the crane has larger general load and longer travel, and has strict requirements on the installation position and the installation space of the electric cylinder. In order to meet load requirements, the electric cylinder of the traditional single-motor driving gear reduction mechanism is large in size, and cannot meet the installation requirements of a crane. And the special application working condition of the electric cylinder for the crane can not simultaneously consider the speed and the efficiency of the single motor driving mechanism. Therefore, the drive mechanism needs to be redesigned for the heavy-load electric cylinder for the crane.

Disclosure of utility model

Technical problems:

the large-load large-stroke electric cylinder has the advantages of compact structure and low cost, and can be suitable for a crane.

The technical scheme is as follows:

In one aspect, there is provided a rack and pinion electric cylinder for a crane, comprising: the device comprises a cylinder barrel, a piston rod, a gear shaft and at least two groups of driving components; the piston rod is provided with a rack section extending along the axial direction; the main body part of the piston rod is arranged inside the cylinder barrel in an axial sliding way; the driving assembly comprises a driving motor and a reduction gearbox; the driving motor is in transmission connection with the reduction gearbox; the output end of the reduction gearbox is in transmission connection with the gear shaft; the gear is in transmission connection with the gear shaft, the gear is meshed with the rack section, and the gear is rotatably fixed with the cylinder barrel through the gear shaft so as to drive the piston rod to axially move along the cylinder barrel.

In some embodiments, the rack and pinion electric cylinder for a crane further comprises a base, a piston rod limit sleeve and a rod head; the first end of the cylinder barrel is fixedly connected with the base; the piston rod limiting sleeve is sleeved at one end of the piston rod, which is close to the base, and is in sliding fit with the inner wall of the cylinder barrel so as to carry out sliding guide support on the piston rod; the piston rod limiting sleeve is limited in the cylinder barrel; the rod head is fixedly connected to one end, far away from the base, of the piston rod; the club head is located outside the cylinder barrel.

In another aspect, there is provided a rack and pinion electric cylinder for a crane, including: the device comprises a cylinder barrel, a piston rod, a gear shaft, a rack section and at least two groups of driving components; the first end of the piston rod is fixedly connected with the rack section, and the rack section extends along the axial direction of the piston rod; the rack section and the main body part of the piston rod are axially and slidably arranged in the cylinder barrel; the driving assembly comprises a driving motor and a reduction gearbox; the driving motor is in transmission connection with the reduction gearbox; the output end of the reduction gearbox is in transmission connection with the gear shaft; the gear is in transmission connection with the gear shaft, the gear is meshed with the rack section, and the gear is rotatably fixed with the cylinder barrel through the gear shaft so as to drive the piston rod to axially move along the cylinder barrel.

In some embodiments, the number of drive assemblies is an even number of groups; all the driving components are symmetrically arranged on two sides of the gear and are in transmission connection with the gear.

In some embodiments, the reduction gearbox comprises a parallel axis gear reduction mechanism or a planetary gear reduction mechanism.

In some embodiments, the rack and pinion electric cylinder for a crane further comprises: the device comprises a base, a piston rod limit sleeve, a rack limit sleeve and a rod head; the first end of the cylinder barrel is fixedly connected with the base; the piston rod limiting sleeve is sleeved at the first end of the piston rod, the piston rod limiting sleeve is in sliding fit with the inner wall of the cylinder barrel, the rack limiting sleeve is sleeved at one end, far away from the piston rod, of the rack section, and the rack limiting sleeve is in sliding fit with the inner wall of the cylinder barrel so as to carry out sliding guide support on the rack section and the piston rod; the rack limiting sleeve and/or the piston rod limiting sleeve are/is limited in a designated area inside the cylinder barrel so as to limit the limit extension position and the limit retraction position of the piston rod; the rod head is fixedly connected to one end, far away from the base, of the piston rod; the club head is located outside the cylinder barrel.

The beneficial effects are that:

1. the utility model provides two large-load and large-stroke electric cylinders which have compact structures and low cost and can be suitable for cranes.

2. According to the gear-rack electric cylinder for the crane, the integrated structure of the gear and the rack section on the piston rod is optimized, so that the internal structure of the cylinder barrel is simplified, and the cost is reduced. The utility model adopts the meshing structure of the gear and the rack section to drive the piston rod to move, and adopts at least two groups of driving components to drive the gear to rotate, thereby improving the transmission power and greatly increasing the transmission stroke and the transmission efficiency. When in actual use, the working state of each driving component can be adjusted according to the load condition, so that the efficient action of the rack-and-pinion electric cylinder is synchronously realized, and the energy consumption is saved.

3. Compared with the existing transmission mechanism in which the electric cylinder adopts a synchronous belt or a synchronous chain, the bearing capacity and the service life of the gear rack electric cylinder for the crane are greatly improved, the transmission efficiency is higher, and the precision is higher. Compared with the single motor driving gear reduction mechanism applied to the heavy-load electric cylinder, the structure of the gear rack electric cylinder for the crane greatly reduces the volume of a driving assembly, is more convenient to install and reduces the cost. Compared with the existing ball screw mechanism, the gear rack electric cylinder for the crane has the advantages that the transmission capacity and the transmission stroke are obviously improved, and the use requirements of special large-load large-stroke application working conditions of the electric cylinder for the crane can be better met.

Drawings

In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are required to be used in some embodiments of the present utility model will be briefly described below, however, the drawings in the following description are only drawings of some embodiments of the present utility model, and other drawings may be obtained according to these drawings for those of ordinary skill in the art. Furthermore, the drawings in the following description may be regarded as schematic diagrams, not limiting the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. according to the embodiments of the present utility model.

FIG. 1 is a block diagram of a rack and pinion electric cylinder for a crane according to some embodiments;

Fig. 2 is a block diagram of a rack and pinion electric cylinder for a crane according to other embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments obtained by a person skilled in the art based on the embodiments provided by the present utility model fall within the scope of protection of the present utility model.

Throughout the specification and claims, the term "comprising" is to be interpreted as an open, inclusive meaning, i.e. "comprising, but not limited to, unless the context requires otherwise. In the description of the present specification, the terms "one embodiment," "some embodiments," "example embodiments," "examples," "particular examples," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the utility model. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first" and "second" are used below 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In describing some embodiments, expressions of "coupled" and "connected" and their derivatives may be used. The term "coupled" is to be interpreted broadly, as referring to, for example, a fixed connection, a removable connection, or a combination thereof; can be directly connected or indirectly connected through an intermediate medium. The term "coupled" means that two or more elements are in direct physical or electrical contact. The term "coupled" or "communicatively coupled" may also mean that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other. The embodiments of the utility model herein are not necessarily limited to what is described herein.

At least one of "A, B and C" has the same meaning as at least one of "A, B or C" and includes the following combinations of A, B and C: a alone, B alone, C alone, a combination of a and B, a combination of a and C, a combination of B and C, and a combination of A, B and C.

"A and/or B" includes the following three combinations: only a, only B, and combinations of a and B.

As used herein, the term "if" is optionally interpreted to mean "when … …" or "at … …" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if determined … …" or "if a [ stated condition or event ] is detected" is optionally interpreted to mean "upon determination … …" or "in response to determination … …" or "upon detection of a [ stated condition or event ]" or "in response to detection of a [ stated condition or event ], depending on the context.

The use of "adapted" or "configured to" herein is meant to be an open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

In addition, the use of "based on" is intended to be open and inclusive in that a process, step, calculation, or other action "based on" one or more of the stated conditions or values may be based on additional conditions or beyond the stated values in practice.

As used herein, "about," "approximately" or "approximately" includes the stated values as well as average values within an acceptable deviation range of the particular values as determined by one of ordinary skill in the art in view of the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system).

As used herein, "parallel", "perpendicular", "equal" includes the stated case as well as the case that approximates the stated case, the range of which is within an acceptable deviation range as determined by one of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system). For example, "parallel" includes absolute parallel and approximately parallel, where the acceptable deviation range for approximately parallel may be, for example, a deviation within 5 °; "vertical" includes absolute vertical and near vertical, where the acceptable deviation range for near vertical may also be deviations within 5 °, for example. "equal" includes absolute equal and approximately equal, where the difference between the two, which may be equal, for example, is less than or equal to 5% of either of them within an acceptable deviation of approximately equal.

Exemplary embodiments are described herein with reference to cross-sectional and/or plan views as idealized exemplary figures. In the drawings, the thickness of layers and regions are exaggerated for clarity. Thus, variations from the shape of the drawings due to, for example, manufacturing techniques and/or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of example embodiments.

Key term definition:

electric cylinder: an actuating mechanism consisting of a motor-driven linear actuator.

In some embodiments, there is provided a rack and pinion electric cylinder for a crane, as shown in fig. 1, including: a cylinder 6, a piston rod 5, a gear 2, a gear shaft 8 and at least two sets of drive assemblies 10 (two sets of drive assemblies 10 are included in fig. 1); the piston rod 5 is provided with a rack section 3 extending along the axial direction; the main body portion of the piston rod 5 is axially slidably disposed inside the cylinder tube 6; the drive assembly 10 includes a drive motor and a reduction gearbox; the driving motor is in transmission connection with the reduction gearbox; the output end of the reduction gearbox is in transmission connection with the gear shaft 8; the gear 2 is in transmission connection with the gear shaft 8, the gear 2 is meshed with the rack section 3, and the gear 2 is rotatably fixed with the cylinder 6 through the gear shaft 8 so as to drive the piston rod 5 to axially move along the cylinder 6.

Wherein the rack section 3 is formed at one side outer wall of the piston rod 5.

In some embodiments, as shown in fig. 1, the rack and pinion electric cylinder for the crane further comprises a base 4, a piston rod limit sleeve 5-1 and a rod head 7; the first end of the cylinder barrel 6 is fixedly connected with the base 4; the piston rod limiting sleeve 5-1 is sleeved at one end of the piston rod 5, which is close to the base 4, and the piston rod limiting sleeve 5-1 is in sliding fit with the inner wall of the cylinder barrel 6 so as to carry out sliding guide support on the piston rod 5; the piston rod limiting sleeve 5-1 is limited in the cylinder barrel 6; the rod head 7 is fixedly connected to one end of the piston rod 5 far away from the base 4; the rod head 7 is located outside the cylinder tube 6. Thus, the piston rod 5 can be restricted in the extreme extended position and the extreme retracted position by the engagement of the piston rod stop 5-1, the cylinder tube 6 and the piston rod 5.

In some embodiments, there is provided a rack and pinion electric cylinder for a crane, as shown in fig. 2, including: a cylinder 6, a piston rod 5, a gear 2, a gear shaft 8, a rack section 3 and at least two sets of drive assemblies 10; the first end of the piston rod 5 is fixedly connected with the rack section 3, and the rack section 3 extends along the axial direction of the piston rod 5; the rack section 3 and the main body part of the piston rod 5 are arranged inside the cylinder barrel 6 in an axial sliding way; the drive assembly 10 includes a drive motor and a reduction gearbox; the driving motor is in transmission connection with the reduction gearbox; the output end of the reduction gearbox is in transmission connection with the gear shaft 8; the gear 2 is in transmission connection with the gear shaft 8, the gear 2 is meshed with the rack section 3, and the gear 2 is rotatably fixed with the cylinder 6 through the gear shaft 8 so as to drive the piston rod 5 to axially move along the cylinder 6.

In some embodiments, as shown in fig. 2, the rack and pinion electric cylinder for a crane further includes: the device comprises a base 4, a piston rod limit sleeve 5-1, a rack limit sleeve 3-1 and a rod head 7; the first end of the cylinder barrel 6 is fixedly connected with the base 4; the piston rod limiting sleeve 5-1 is sleeved at the first end of the piston rod 5, the piston rod limiting sleeve 5-1 is in sliding fit with the inner wall of the cylinder barrel 6, the rack limiting sleeve 3-1 is sleeved at one end, far away from the piston rod 5, of the rack section 3, and the rack limiting sleeve 3-1 is in sliding fit with the inner wall of the cylinder barrel 6 so as to carry out sliding guide support on the rack section 3 and the piston rod 5; the rack limiting sleeve 3-1 and/or the piston rod limiting sleeve 5-1 are limited in a designated area inside the cylinder barrel 6 so as to limit the limit extension position and the limit retraction position of the piston rod 5; the rod head 7 is fixedly connected to one end of the piston rod 5 far away from the base 4; the rod head 7 is located outside the cylinder tube 6.

For example, fig. 1 and 2 illustrate a dual motor driven rack and pinion electric cylinder comprising two sets of drive assemblies 10: comprises a first driving motor I, a first reduction gearbox I-1, a second driving motor II and a second reduction gearbox II-1. The first driving motor I is in transmission connection with the first reduction gearbox I-1, and the output end of the first reduction gearbox I-1 is in transmission connection with the gear shaft 8; the second driving motor II is in transmission connection with the second reduction gearbox II-1, and the output end of the second reduction gearbox II-1 is in transmission connection with the gear shaft 8; the gear 2 is in transmission connection with the gear shaft 8.

To further facilitate the installation of rack and pinion electric cylinders for cranes, in some embodiments, as shown in fig. 1 and 2, the number of drive assemblies 10 is an even number of groups; all driving assemblies 10 are symmetrically arranged on both sides of the gear wheel 2 and are in transmission connection with the gear wheel 2. Therefore, compared with the installation of a high-power driving assembly, the installation space of the rack-and-pinion electric cylinder for the crane can be reduced; compared with the scheme that a plurality of groups of driving components are arranged on the same side of the gear, the driving components 10 are symmetrically arranged on two sides of the gear 2 and are in transmission connection with the gear 2, so that the installation of the rack-and-pinion electric cylinder for the crane can be facilitated.

For example, as shown in fig. 1 and 2, the first driving motor I and the first reduction gearbox I-1, the second driving motor II and the second reduction gearbox II-1 are symmetrically arranged at two sides of the cylinder 6 near one end of the club head 7 respectively, and the specifications are the same.

The working principle of the gear rack electric cylinder for the crane is as follows:

When the driving assembly 10 is in a heavy-load working condition, the driving assemblies 10 work simultaneously, at the moment, the driving motors rotate simultaneously, and power provided by the driving motors is coupled at the gear 2 through the corresponding reduction gearbox and drives the rack 3 and the piston rod 5 to extend or retract along the axial direction. Specifically, when the rack and pinion electric cylinder driven by the dual motor shown in fig. 1 or 2 is employed, the first driving motor I outputs power simultaneously with the second driving motor II.

When the driving assembly is in the light-load working condition, the number of the driving assemblies 10 in the working state is reduced according to the load condition. Specifically, when the rack and pinion electric cylinder driven by the dual motors shown in fig. 1 or 2 is used, one of the first drive motor I and the second drive motor II outputs power, and the other does not operate.

The utility model provides two large-load and large-stroke electric cylinders which have compact structures and low cost and can be suitable for cranes. According to the gear-rack electric cylinder for the crane, the integrated structure of the gear and the rack section on the piston rod is optimized, so that the internal structure of the cylinder barrel is simplified, and the cost is reduced. The utility model adopts the meshing structure of the gear and the rack section to drive the piston rod to move, and adopts at least two groups of driving components to drive the gear to rotate, thereby improving the transmission power and greatly increasing the transmission stroke. When in actual use, the working state of each driving component can be adjusted according to the load condition, so that the efficient action of the rack-and-pinion electric cylinder is synchronously realized, and the energy consumption is saved.

Compared with the existing transmission mechanism in which the electric cylinder adopts a synchronous belt or a synchronous chain, the bearing capacity and the service life of the gear rack electric cylinder for the crane are greatly improved, the transmission efficiency is higher, and the precision is higher. Compared with the single motor driving gear reduction mechanism applied to the heavy-load electric cylinder, the structure of the gear rack electric cylinder for the crane greatly reduces the volume of a driving assembly, is more convenient to install and reduces the cost. Compared with the existing ball screw mechanism, the gear rack electric cylinder for the crane has the advantages that the transmission capacity and the transmission stroke are obviously improved, and the use requirement of large load and large stroke can be better met.

In some embodiments, reduction box I-1 includes a parallel axis gear reduction mechanism or a planetary gear reduction mechanism.

In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is merely illustrative of the embodiments of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will recognize that changes and substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (6)

1. A rack and pinion electric cylinder for a crane, comprising: the device comprises a cylinder barrel, a piston rod, a gear shaft and at least two groups of driving components;

The piston rod is provided with a rack section extending along the axial direction; the main body part of the piston rod is arranged inside the cylinder barrel in an axial sliding way;

The driving assembly comprises a driving motor and a reduction gearbox; the driving motor is in transmission connection with the reduction gearbox; the output end of the reduction gearbox is in transmission connection with the gear shaft; the gear is in transmission connection with the gear shaft, the gear is meshed with the rack section, and the gear is rotatably fixed with the cylinder barrel through the gear shaft so as to drive the piston rod to axially move along the cylinder barrel.

2. The rack and pinion electric cylinder for a crane according to claim 1, further comprising a base, a piston rod stop collar, and a rod head; the first end of the cylinder barrel is fixedly connected with the base;

The piston rod limiting sleeve is sleeved at one end of the piston rod, which is close to the base, and is in sliding fit with the inner wall of the cylinder barrel so as to carry out sliding guide support on the piston rod; the piston rod limiting sleeve is limited in the cylinder barrel;

The rod head is fixedly connected to one end, far away from the base, of the piston rod; the club head is located outside the cylinder barrel.

3. A rack and pinion electric cylinder for a crane, comprising: the device comprises a cylinder barrel, a piston rod, a gear shaft, a rack section and at least two groups of driving components;

The first end of the piston rod is fixedly connected with the rack section, and the rack section extends along the axial direction of the piston rod; the rack section and the main body part of the piston rod are axially and slidably arranged in the cylinder barrel;

The driving assembly comprises a driving motor and a reduction gearbox; the driving motor is in transmission connection with the reduction gearbox; the output end of the reduction gearbox is in transmission connection with the gear shaft; the gear is in transmission connection with the gear shaft, the gear is meshed with the rack section, and the gear is rotatably fixed with the cylinder barrel through the gear shaft so as to drive the piston rod to axially move along the cylinder barrel.

4. A rack and pinion electric cylinder for a crane according to any one of claims 1 to 3, wherein the number of the drive assemblies is an even number of groups;

All the driving components are symmetrically arranged on two sides of the gear and are in transmission connection with the gear.

5. A rack and pinion electric cylinder for a crane according to any one of claims 1 to 3, characterized in that the reduction gearbox comprises a parallel axis gear reduction mechanism or a planetary gear reduction mechanism.

6. The rack and pinion electric cylinder for a crane according to claim 3, further comprising: the device comprises a base, a piston rod limit sleeve, a rack limit sleeve and a rod head; the first end of the cylinder barrel is fixedly connected with the base;

The piston rod limiting sleeve is sleeved at the first end of the piston rod, the piston rod limiting sleeve is in sliding fit with the inner wall of the cylinder barrel, the rack limiting sleeve is sleeved at one end, far away from the piston rod, of the rack section, and the rack limiting sleeve is in sliding fit with the inner wall of the cylinder barrel so as to carry out sliding guide support on the rack section and the piston rod; the rack limiting sleeve and/or the piston rod limiting sleeve are/is limited in a designated area inside the cylinder barrel so as to limit the limit extension position and the limit retraction position of the piston rod;

The rod head is fixedly connected to one end, far away from the base, of the piston rod; the club head is located outside the cylinder barrel.