Crawler crane slewing digital piston motor

Abstract

The application discloses a digital plunger motor for the slewing of a crawler crane, comprising a plunger motor, a reduction section, a connecting section, a digital valve and a stepping motor which are connected in sequence, wherein the reduction section, the connecting section and the digital valve have the same outer peripheral contour shape, recessed areas are formed on the four corners of the outer peripheral wall of the reduction section, the recessed areas are located at the axial middle positions of the reduction section and are used for the centralized installation of front and rear screws, lateral openings for the installation of the screws are formed in the front and rear outer peripheral walls of each recessed area, a mounting seat is arranged at the front end of the plunger motor, a bearing for supporting the rotating shaft of the motor is arranged in the mounting seat, a connecting piece is arranged in the connecting section, the output shaft of the reduction section is connected with the feedback shaft of the digital valve through the connecting piece, and then the rotating speed of the motor is fed back to the digital valve after being reduced by the reduction section. The application integrates the functional components of the digital hydraulic motor into one, so as to meet the engineering requirements of the slewing drive of the crawler crane.

Description

TECHNICAL FIELD

[0001] The present application relates to a digital piston motor for a crawler crane slewing. BACKGROUND

[0002] In modern industry, hydraulic technology is increasingly widely used in various types of engineering machinery. With the increasing degree of automation control of the hydraulic system, the number of functional units in the system increases, and the problem of bidirectional communication between the functional units in the system, between the functional units, and between the functional units and the controller is increasingly prominent. Users have increasingly high requirements for the intelligence, controllability, and maintainability of the functional units.

[0003] In a crawler crane (hereinafter referred to as a crawler crane), a piston motor, as a hydraulic actuator of a hoisting mechanism, can convert hydraulic energy into mechanical energy and do work externally. It has a large power-to-weight ratio and can adapt to rotary motion driving under heavy load conditions. With the development of digital intelligence of the crawler crane, the main machine manufacturer has proposed a design requirement to continuously adjust the rotation direction and rotation speed and angle of the motor according to the working condition requirements.

[0004] Chinese inventor Yang Shixiang disclosed a digital pulse valve system (CN85108167A) in 1985. The document introduces a valve port control system with a valve core and a nut sleeve threaded together. The valve port is closed through mechanical (or electrical) feedback, so that the actuator tracks the rotation speed and angle of the stepper motor, achieving high-precision open-loop speed control and position control.

[0005] Chinese inventor Yang Shixiang et al. disclosed a digital hydraulic motor (CN103216478B) in 2012. The digital hydraulic motor includes a motor and a digital servo valve. The digital servo valve has a drive motor, and the motor has a double-output shaft connected to the feedback shaft of the digital servo valve at one end and connected to a load at the other end, forming a mechanical closed loop.

[0006] In a crawler crane, a digital hydraulic motor is used to replace an ordinary hydraulic motor to achieve intelligent control. However, the market still lacks a corresponding digital hydraulic motor product for the slewing of a crawler crane, so it is necessary to provide a digital hydraulic motor product suitable for engineering applications. SUMMARY

[0007] The present application aims to provide a digital piston motor for a crawler crane slewing, which integrates various functional elements into one, as a replaceable independent component, to meet the engineering requirements of intelligent control of the slewing of a crawler crane.

[0008] To this end, the application provides a digital plunger motor for a crawler crane, comprising a plunger motor, a reduction section, a connecting section, a digital valve and a stepping motor connected in sequence, and the whole is in a straight column shape, recessed areas are formed on the four corners of the outer peripheral wall of the reduction section, the recessed areas are located at the axial middle position of the reduction section, and are used for the centralized installation of front and rear screws, and lateral openings for installing the screws are formed on the front and rear outer peripheral walls of each recessed area; the front end of the plunger motor is provided with a mounting seat, a bearing for supporting the motor rotating shaft is arranged in the mounting seat, a connecting piece is arranged in the connecting section, the output shaft of the reduction section is connected with the feedback shaft of the digital valve through the connecting piece, and then the motor rotating speed is fed back to the digital valve after being reduced by the reduction section.

[0009] The application also provides a digital plunger motor for a crawler crane, comprising a plunger motor, a reduction section, a connecting section, a digital valve and a stepping motor connected in sequence, and the whole is in a straight column shape, recessed areas are formed on the four corners of the outer peripheral wall of the reduction section, the recessed areas are located at the axial middle position of the reduction section, and are used for the centralized installation of front and rear screws, and lateral openings for installing the screws are formed on the front and rear outer peripheral walls of each recessed area; the front end of the plunger motor is provided with a mounting seat, a bearing for supporting the motor rotating shaft is arranged in the mounting seat, a connecting piece is arranged in the connecting section, the output shaft of the reduction section is connected with the feedback shaft of the digital valve through the connecting piece, and then the motor rotating speed is fed back to the digital valve after being reduced by the reduction section.

[0010] According to the digital plunger motor, the digital valve is connected with the digital valve in sequence through the connecting section and the reduction section, a mounting seat for bearing supporting the motor rotating shaft is designed at the front end of the plunger motor, the output shaft of the plunger motor is connected with the feedback shaft of the digital valve through the reduction, and thus the functional components of the digital hydraulic motor are integrated, so as to meet the engineering requirements of the intelligent control of the crawler crane.

[0011] In addition to the objects, features and advantages described above, the application has other objects, features and advantages. The application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0012] The drawings constituting a part of the specification of the application are used to provide further understanding of the application, the schematic embodiments of the application and the description thereof are used to explain the application, and do not constitute improper limitation on the application. In the drawings:

[0013] Figure 1 An external structure schematic view of the digital plunger motor for a crawler crane according to the first embodiment of the application is shown;

[0014] Figure 2Fig. 1 shows a schematic diagram of the internal structure of a digital piston motor for a crawler crane according to a first embodiment of the present application;

[0015] Figure 3 Fig. 2 shows a schematic diagram of the three-dimensional structure of a digital piston motor for a crawler crane according to the first embodiment of the present application;

[0016] Figure 4 Fig. 5 shows a schematic diagram of the internal structure of a digital piston motor for a crawler crane according to a second embodiment of the present application; and

[0017] Figure 5 Fig. 6 shows a schematic diagram of the three-dimensional structure of a digital piston motor for a crawler crane according to the second embodiment of the present application. DETAILED DESCRIPTION

[0018] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0019] COMBINATION Figures 1 to 3 The digital piston motor of the first embodiment of the present application mainly comprises a piston motor 1, a reduction section 2, a coupling section 3, a digital valve 4 and a stepping motor 5 connected in series, and has a straight column shape as a whole.

[0020] The piston motor 1 is provided with a mounting seat 6 at the front end. The mounting seat 6 has a seat cover 61, a first seat plate 62 and a second seat plate 63 integrally formed on the outer periphery of the seat cover 61.

[0021] The seat cover 61 is provided with a bearing 64 for supporting the motor shaft 11. The seat cover 61 is positioned and fitted with the stepped surface of the front cover of the piston motor 1. For example, the mounting seat 6 is pressed and fitted on the stepped surface of the front cover after being heated, and an interference fit is formed between the seat cover 61 and the stepped surface of the front cover after cooling.

[0022] The first seat plate 62 and the second seat plate 63 are both quadrilaterals, and are arranged axially forward and backward and circumferentially staggered by 45°.

[0023] The first seat plate 62 is provided with mounting notches at the four corners, for mounting the digital piston motor on the main machine by screws. The second seat plate 63 is connected with the front cover of the piston motor 1 by four corner screws.

[0024] The structure design of the mounting seat 6 improves the installation stress condition of the slender structure (digital piston motor).

[0025] The deceleration section 2, the connecting section 3 and the digital valve 4 have equal outer contour sizes, preferably a regular quadrilateral contour. The deceleration section 2 is of a modular design, and the deceleration mechanism is a planetary gear deceleration mechanism to realize coaxial large transmission ratio deceleration, for example, a deceleration ratio of 20, and the plunger motor is 2000r / min, and after deceleration by the deceleration section, the speed is 100r / min.

[0026] The recessed areas 21 are formed on the four corners of the outer peripheral wall of the deceleration section 2, and are located at the middle position of the deceleration section 2, and are used for mounting front and rear screws.

[0027] The front screws are used for screwing the deceleration section with the plunger motor, and the rear screws are used for screwing the deceleration section with the connecting section 3. The front and rear outer peripheral walls of each recessed area are provided with lateral openings 22, so that the screws enter the screw holes through the lateral openings. By providing the lateral openings, the axial length of the recessed area is greatly shortened.

[0028] The connecting section 3 comprises a shell section 31 and a connecting piece 32, and the output shaft 23 of the deceleration section 2 is connected with the feedback shaft 41 of the digital valve 4 through the connecting piece 32.

[0029] The recessed areas 42 are also formed on the four corners of the outer peripheral wall of the digital valve 4, and are used for screw mounting, and the screws are used for screwing the digital valve 4 with the connecting section 3.

[0030] The digital valve has an oil inlet port P and an oil return port O, and working oil ports A and B. The A port and the B port of the digital valve are connected with the plunger motor oil ports K and H respectively through pipelines.

[0031] The driving motor controls the oil supply of the plunger motor by controlling the rotation of the valve core of the digital valve, and the motor speed is reduced through the deceleration section and is fed back to the nut sleeve of the digital valve through the feedback shaft. One end of the valve core is threadedly connected with the nut sleeve, and the motor speed and the rotation direction are controlled through the hydraulic oil by changing the driving rotation direction and the motor speed. If the rotation angle of the driving motor is controlled, the rotation angle of the plunger motor can be correspondingly controlled. The purpose of continuously adjusting the motor rotation direction, speed and angle according to the working condition requirements is achieved. The above-mentioned hydraulic valve can be purchased from Beijing Yimei Technology Co., Ltd.

[0032] Combined with reference Figure 4 and Figure 5 , the digital plunger motor of the second embodiment of the present application is sequentially connected by the plunger motor 1, the deceleration section 2, the connecting section 3, the digital valve 4 and the stepping motor 5, and the whole is in a right angle shape to adapt to the requirement of smaller installation space.

[0033] The deceleration section 2 is mainly composed of a right-angle decelerator and a right-angle adapter 2b, wherein the left end of the right-angle adapter 2b is connected with the plunger motor 1 in series, and the lower end of the right-angle adapter 2b is connected with the upper end of the connecting section 3 through a screw. The top and back of the right-angle adapter 2b are provided with installation grooves for installing the right-angle decelerator.

[0034] The deceleration mechanism of the right-angle decelerator is a planetary gear deceleration mechanism, so as to realize 90° rotation angle and large transmission ratio deceleration, for example, the deceleration ratio is 15.

[0035] The front end of the plunger motor 1 is provided with a mounting seat 6, the mounting seat 6 has a seat cover 65 and a seat plate 66, and the lengthened seat cover 65 is provided with a bearing 64 for supporting the lengthened motor rotating shaft 11. The left and right sides of the seat plate 66 are provided with lugs 67, and the lugs 67 are connected with an external main machine through screws.

[0036] According to the digital plunger motor, the hydraulic pump in the hydraulic system of the crawler crane delivers hydraulic oil to the plunger motor for controlling the rotating mechanism through the digital valve, the rotating direction, the rotating speed and the rotating angle of the motor can be continuously adjusted according to the working condition by operating the digital valve control rod, and the engineering requirement of the intelligent control of the rotating of the crawler crane is realized.

[0037] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A digital piston motor for slewing of a crawler crane, characterized in that, It includes a piston motor, a reduction section, a connecting section, a digital valve, and a stepper motor connected in series, forming a straight column shape. The four corners of the outer peripheral wall of the deceleration section each form a recessed area, which is located at the axial middle position of the deceleration section and is used for the centralized installation of front and rear screws. The front and rear outer peripheral walls of each recessed area are provided with lateral openings for installing screws. The piston motor has a mounting base at its front end, which contains a bearing that supports the motor shaft. The connecting section has a connecting member, and the output shaft of the deceleration section is connected to the feedback shaft of the digital valve through the connecting member. Thus, the motor speed is decelerated by the deceleration section and then fed back to the digital valve.

2. The digital piston motor for slewing of a crawler crane according to claim 1, characterized in that, The deceleration mechanism in the deceleration section is a planetary gear reduction mechanism.

3. The digital piston motor for slewing of a crawler crane according to claim 1, characterized in that, The deceleration section, the connecting section, and the digital valve all have a rectangular outer perimeter shape.

4. The digital piston motor for slewing of a crawler crane according to claim 1, characterized in that, The mounting base has a cover, a first base plate and a second base plate integrally formed on the outer periphery of the cover, the first base plate being connected to an external host, and the second base plate being connected to the front cover of the piston motor.

5. The digital piston motor for slewing of a crawler crane according to claim 1, characterized in that, The connecting section includes a housing section and a connecting member, wherein the output shaft of the deceleration section is connected to the feedback shaft of the digital valve via the connecting member.

6. A digital piston motor for slewing of a crawler crane, characterized in that, It includes a piston motor, a reduction section, a connecting section, a digital valve, and a stepper motor connected in series, forming a right-angled structure. The reduction section includes a right-angle reducer and a right-angle adapter. The left end of the right-angle adapter is connected to the piston motor, and the lower end of the right-angle adapter is connected to the upper end of the connecting section. The left end of the right-angle reducer is mounted on the right-angle adapter, and the lower end of the right-angle reducer is connected to the connecting section. The piston motor has a mounting base at its front end, which contains a bearing that supports the motor shaft. The connecting section has a connecting member, and the output shaft of the deceleration section is connected to the feedback shaft of the digital valve through the connecting member. Thus, the motor speed is decelerated by the deceleration section and then fed back to the digital valve.

7. The digital piston motor for slewing of a crawler crane according to claim 6, characterized in that, The right-angle adapter has mounting slots on its top and back for mounting a right-angle reducer, the reduction mechanism of which is a planetary gear reduction mechanism.

8. The digital piston motor for slewing of a crawler crane according to claim 6, characterized in that, The mounting base includes a cover and a plate. The plate is connected to the piston motor and has connecting lugs on its left and right sides for connection to an external host.

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