Compact micro-excavation single-power control pump

Abstract

The utility model provides a compact type micro-excavation single power control pump which comprises a pump shell, a transmission shaft, a cylinder body and a plurality of plungers are arranged on the pump shell, the transmission shaft is used for driving the cylinder body to rotate along with the transmission shaft, a plurality of cavities are distributed in the circumferential direction of the cylinder body, and the plungers can slide on the cavities in a guiding mode. A movable space, a cradle and a rotating disc are further arranged in the pump shell, the movable space is formed by spacing between the cylinder body and the opposite inner wall of the pump shell, the transmission shaft is inserted into the cylinder body through the movable space to form transmission fit, and the cradle is arranged in the movable space in a swinging mode. A control rod driven by oil pressure to slide is arranged at one end of the cradle, a reset rod driven by elastic force to slide is arranged at the other end of the cradle, and the rotating disc is arranged on the cylinder body in a swinging mode and attached to the cradle. Aiming at the defects in the prior art, the utility model provides the compact micro-digging single-power control pump which can effectively adjust the power and is higher in stability.

Description

TECHNICAL FIELD

[0001] The utility model relates to pump field especially a compact microdigger single power control pump. BACKGROUND

[0002] As a special equipment for operating in narrow space in the field of engineering construction, the microdigger is widely used in the scene of high requirement for operation precision and limited installation space such as municipal maintenance, indoor decoration, garden maintenance, therefore, the space that can be used for power system installation in its interior is particularly compact, which puts forward strict miniaturization and light weight requirement to the structure size of internal power assembly, and the hydraulic pump is the core power source of the microdigger, and its power output characteristic directly determines the operation performance and running stability of the whole machine, at present, the microdigger generally carries small diesel engine with limited power, and the maximum output power of the engine has an explicit upper limit, and in the actual operation process, when the microdigger performs compound action, such as synchronous operation of boom lifting and rotation or such as digging hard soil, rock and the like, the transient power required by the hydraulic pump is easy to exceed the maximum output power threshold of the engine, under this working condition, if the existing hydraulic pump lacks effective power regulation mechanism, the engine speed will sharply decrease, and even the engine will be shut down in serious cases, which not only causes operation interruption, but also may cause irreversible damage to the core components such as engine and hydraulic system due to transient load impact.

[0003] However, the control pump of the prior art lacks effective power control, when the system appears power overload, the hydraulic system is easy to cause overflow, a large amount of heat is generated, the system temperature sharply rises, and at the same time, the engine frequently shuts down and restarts, which further aggravates the working stress and thermal load of the hydraulic element. Under the working condition for a long time, the core components such as cylinder body, plunger and sealing element of the hydraulic pump are easy to appear problems such as accelerated wear, sealing failure, which significantly shortens the service life of the hydraulic system, increases the equipment maintenance cost and fault shutdown frequency. UTILITY MODEL CONTENTS

[0004] In view of the defects of the prior art, the utility model provides a compact microdigger single power control pump with effective power regulation and stronger stability.

[0005] To achieve the above object, the utility model provides a kind of compact micro-dig single power control pump, including pump shell, the transmission shaft, cylinder and several plunger are provided on the pump shell, the transmission shaft is used to drive cylinder to rotate with it, the cylinder is peripherally arranged with several cavities for plunger to guide sliding thereon, the pump shell is further provided with activity space, cradle and rotating disc, the activity space is formed by the interval between cylinder and the opposite inner wall of pump shell, the transmission shaft is inserted to cylinder through activity space and forms transmission cooperation, the cradle is swing set in activity space, and the control rod driven by oil pressure is slidably arranged at one end of cradle, reset rod driven by elastic force is slidably arranged at the other end of cradle, and the rotating disc is swing set on cylinder and is attached to cradle.

[0006] The advantages of the above technical scheme are: by forming an activity space between the cylinder and the opposite inner wall of the pump shell, the key adjusting components such as the cradle and the rotating disc are integrated in the space, and the transmission shaft forms transmission cooperation with the cylinder through the activity space, without the need for additional complex installation cavities, greatly simplifying the overall structural layout, effectively reducing the volume of the pump body, better adapting to the narrow main machine installation space of the micro-excavator, the structure is more compact, and the control rod at one end of the cradle is driven by control oil to realize telescopic adjustment, and the reset rod at the other end is driven by elastic force to form reset cooperation, and the rotating disc attached to the cradle and swing set on the cylinder can drive the rotating disc to adjust the relative movement state of the cylinder and the plunger by driving the cradle to swing when the load changes, thereby dynamically adjusting the displacement of the pump, when the load increases to cause the hydraulic power demand to approach the upper limit of the engine, the displacement can be automatically reduced to reduce the power demand, to avoid sudden speed reduction or engine stall, and the reset rod can quickly push the cradle to reset when the load decreases, to ensure that the displacement is promptly restored to meet the work efficiency, in addition, the integrated adjusting structure also reduces the hidden troubles caused by multi-module transmission, further improves the operation reliability of the hydraulic pump, ensures the service life of the product, and better meets the needs of the micro-excavator.

[0007] The utility model can be further provided as: the pump shell is provided with a control cylinder and a power control valve, the control cylinder is arranged at one end of the cradle, the control rod is slidably inserted into the control cylinder, and the control cylinder is provided with a control oil path connected to the power control valve.

[0008] By further setting, by setting the control cylinder corresponding to one end of the rocker on the pump shell, and making the control rod slidingly inserted in the control cylinder, and at the same time making the control cylinder communicated with the power control valve through the control oil way, a hydraulic drive adjustment is formed, the power control valve can regulate the control oil pressure entering the control cylinder according to the working condition requirement, and then the extension and retraction amount of the control rod is controlled, the adjustment of the swing angle of the rocker is realized, at the same time, the control cylinder, the control rod and the power control valve are integrated in the pump shell structure, without additional external driving components, the stability of the hydraulic control is ensured, the overall compact layout of the pump body is maintained, and the narrow installation space of the micro excavator is further adapted.

[0009] The utility model discloses further can set up as: the pump shell include the oil return oil way and the high pressure oil way corresponding pump export, the power control valve include control chamber, valve core and first control spring, control chamber connects control oil way, high pressure oil way and oil return oil way, valve core can by the oil hydraulic pressure of high pressure oil way under the action overcome first control spring and move towards one end direction, and make high pressure oil way with control oil way communicate, and valve core can be under the elastic force of first control spring and move towards the other end direction, and make oil return oil way with control oil way communicate.

[0010] By further setting, by making the control chamber of the power control valve directly communicated with the high pressure oil way of the pump outlet, the power control valve can realize real-time sensing of the load pressure of the pump output, when the load increases to cause the pressure of the high pressure oil way of the pump outlet to rise, the oil pressure acts on the valve core to overcome the elastic force of the first control spring to drive the valve core to move, so that the high pressure oil way is communicated with the control oil way, at this time, the high pressure oil enters the control cylinder as control oil to drive the control rod to drive the rocker to act to reduce the displacement of the pump, thereby reducing the hydraulic power requirement, and avoiding the overload of the engine, when the load decreases and the pressure of the high pressure oil way decreases, the elastic force of the first control spring drives the valve core to reset, so that the control oil way is communicated with the oil return oil way, and the control oil is discharged through the oil return oil way, and the rocker is reset under the action of the reset rod to increase the displacement, thereby guaranteeing the operation efficiency, without external complex control pipeline, the overall volume is further compressed, the narrow installation space of the micro excavator is adapted, and the dependence on electronic components is reduced by pure mechanical and hydraulic control, and the operation reliability in harsh working conditions is improved.

[0011] The utility model discloses further can set up as: the rocker is provided with feedback rod, the power control valve include valve sleeve and second control spring, feedback rod and valve sleeve abutment limit, and feedback rod can set along with the swing of rocker, second control spring can make valve sleeve move to the position of the closed power control valve by the elastic force.

[0012] Further, the feedback rod is arranged to swing with the rocker, and the feedback rod is abutted and limited with the valve sleeve of the power control valve, and the elastic reset action of the second control spring to the valve sleeve is combined, with the swinging of the rocker to the maximum or close to the maximum position driven by the control rod, the feedback rod gradually moves until the elastic force of the second control spring to the valve sleeve pushes the valve sleeve to close the power control valve, which is equivalent to adding a layer of safety measures, and further guarantees the continuous stability of the hydraulic pump power control.

[0013] The utility model disciously further set up: the both ends of rocker are provided with ball head and slide shoe seat, the ball head swing setting is on slide shoe seat, and the slide shoe seat of rocker both ends is connected on control rod and reset rod respectively.

[0014] Further, the ball head and slide shoe seat swing cooperation structure is arranged on both ends of the rocker, and the slide shoe seat is connected with the control rod and the reset rod respectively, which realizes the multi-angle transmission between the rocker, the control rod and the reset rod, and further improves the reliability of the pump body operation.

[0015] The utility model disciously further set up: the pump shell is provided with reset cylinder at the other end corresponding to the rocker, the reset rod is slidably inserted into the reset cylinder, and the reset spring is arranged between the reset rod and the reset cylinder.

[0016] Further, the reset cylinder is arranged at the other end of the rocker corresponding to the pump shell, part of high-pressure oil is provided for the reset rod as a supplement of reset force, and the reset cylinder provides guidance, which guarantees the stability and accuracy of the reset action of the rocker, when the control oil pressure is reduced, the reset spring can quickly push the reset rod to extend, thereby driving the rocker to swing in the direction of increasing displacement, and the compact layout of the pump body is effectively maintained, and the adaptability is strengthened.

[0017] The utility model disciously further set up: the transmission shaft is provided with a jack pin and a ball hinge, the cylinder body is provided with a cylinder body spring, the ball hinge is slidably abutted with the inner hole of the rotating disc, the cylinder body spring is abutted on the jack pin, and the cylinder body spring can push the jack pin by elasticity, so that the ball hinge abuts the rotating disc on the rocker.

[0018] Further, the cylinder body spring pushes the jack pin, drives the ball hinge to continuously abut the rotating disc on the rocker, forms stable fitting pressure, ensures that the rotating disc and the rocker are gaplessly matched, and avoids the problems of response lag of the rotating disc when the rocker swings or the adjustment accuracy reduction caused by poor fitting. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the utility model embodiment;

[0020] Figure 2The internal structure diagram of the embodiment of the utility model Figure 1 ;

[0021] Figure 3 The embodiment of the utility model Figure 2 The enlarged view of part a in the embodiment of the utility model

[0022] Figure 4 The internal structure diagram of the embodiment of the utility model Figure 2 ;

[0023] Figure 5 The internal structure diagram of the embodiment of the utility model Figure 3 ;

[0024] Figure 6 The embodiment of the utility model Figure 5 The enlarged view of part b in the embodiment of the utility model

[0025] Wherein: pump housing 1;Transmission shaft 11;Top pin 111;Ball hinge 112;Cylinder 12;Cavity 121;Plunger 13;Activity space 14;Control cylinder 15;Control oil circuit 151;Oil return oil circuit 16;Reset spring 17;Reset cylinder 18;Crane 2;Control rod 21;Reset rod 22;Feedback rod 23;Ball head 24;Slide shoe 25;Rotary disc 3;Power control valve 4;Control cavity 41;Valve core 42;First control spring 43;Valve sleeve 44;Second control spring 45;Cylinder spring 5. Specific implementation

[0026] The embodiment of the utility model of a compact micro-dig single power control pump as shown in Figures 1-6 : it includes pump housing 1, the pump housing 1 is provided with transmission shaft 11, cylinder 12 and a plurality of plunger 13, the transmission shaft 11 is used to drive cylinder 12 to rotate with it, the cylinder 12 is circumferentially arranged with a plurality of cavities 121 for the plunger 13 to slide on it, the pump housing 1 is also provided with activity space 14, crane 2 and rotary disc 3, the activity space 14 is formed by the interval between cylinder 12 and the opposite inner wall of pump housing 1, the transmission shaft 11 is inserted into cylinder 12 through activity space 14 to form transmission cooperation, the crane 2 is swingly arranged in activity space 14, one end of crane 2 is provided with control rod 21 driven to slide by oil pressure, the other end of crane 2 is provided with reset rod 22 driven to slide by elastic force, the rotary disc 3 is swingly arranged on cylinder 12 and is attached to crane 2.

[0027] The pump housing 1 is provided with control cylinder 15 and power control valve 4, the control cylinder 15 is arranged at one end of crane 2, the control rod 21 is slidably inserted into control cylinder 15, the control cylinder 15 is provided with control oil circuit 151 connected with power control valve 4.

[0028] The pump housing 1 comprises an oil return oil way 16 and a high pressure oil way corresponding to the pump outlet, the power control valve 4 comprises a control cavity 41, a valve core 42 and a first control spring 43, the control cavity 41 is connected with a control oil way 151, the high pressure oil way and the oil return oil way 16, in the embodiment, the high pressure oil way is connected at the end of the control cavity far from the first control spring 43, not shown in the drawing, the valve core 42 can move towards one end direction by the oil hydraulic pressure of the high pressure oil way to overcome the first control spring 43, and make the high pressure oil way and the control oil way 151 communicate, and the valve core 42 can move towards the other end direction by the elastic force of the first control spring 43, and make the oil return oil way 16 and the control oil way 151 communicate.

[0029] The rocker 2 is provided with a feedback rod 23, the power control valve 4 comprises a valve sleeve 44 and a second control spring 45, the feedback rod 23 is limited by abutting with the valve sleeve 44, and the feedback rod 23 can be set to swing with the rocker 2, the second control spring 45 can make the valve sleeve 44 move to the position of closing the power control valve 4 by the elastic force.

[0030] The rocker 2 is provided with a feedback rod 23, the power control valve 4 comprises a valve sleeve 44 and a second control spring 45, the feedback rod 23 is limited by abutting with the valve sleeve 44, and the feedback rod 23 can be set to swing with the rocker 2, the second control spring 45 can make the valve sleeve 44 move to the position of closing the power control valve 4 by the elastic force.

[0031] The pump housing 1 is provided with a reset cylinder 18 corresponding to the other end of the rocker 2, the reset rod 22 is slidably inserted in the reset cylinder 18, and the reset spring 17 is arranged between the reset rod 22 and the reset cylinder 18.

[0032] The transmission shaft 11 is provided with a top pin 111 and a ball hinge 112, the cylinder body 12 is provided with a cylinder body spring 5, the ball hinge 112 is formed in sliding abutment with the inner hole of the rotating disc 3, the cylinder body spring 5 abuts on the top pin 111, and the cylinder body spring 5 can push the top pin 111 by the elastic force to make the ball hinge 112 abut the rotating disc 3 on the rocker 2.

[0033] The above examples are only one of the preferred specific examples of the present application, and the usual changes and replacements within the technical scheme of the present application by those skilled in the art are all included in the protection scope of the present application.

Claims

1. A compact micro excavator single-power control pump, comprising a pump housing, wherein a drive shaft, a cylinder, and a plurality of plungers are disposed on the pump housing, the drive shaft being used to drive the cylinder to rotate therewith, and the cylinder having a plurality of circumferentially arranged cavities for guiding and sliding the plungers thereon, characterized in that: The pump housing is also provided with a movable space, a rocker arm, and a rotating disk. The movable space is formed by the gap between the inner walls of the cylinder and the pump housing. The transmission shaft is inserted into the cylinder through the movable space to form a transmission engagement. The rocker arm is oscillating in the movable space. One end of the rocker arm is provided with a control rod that is driven to slide by hydraulic pressure, and the other end of the rocker arm is provided with a reset rod that is driven to slide by elastic force. The rotating disk is oscillating on the cylinder and fits against the rocker arm.

2. The compact micro excavator single-power control pump according to claim 1, characterized in that: The pump housing is equipped with a control cylinder and a power control valve. The control cylinder is located at one end of the rocker arm. The control rod is slidably inserted into the control cylinder. The control cylinder is equipped with a control oil circuit that connects to the power control valve.

3. The compact micro excavator single-power control pump according to claim 2, characterized in that: The pump housing includes a return oil passage and a high-pressure oil passage at the corresponding pump outlet. The power control valve includes a control chamber, a valve core, and a first control spring. The control chamber connects the control oil passage, the high-pressure oil passage, and the return oil passage. The valve core can move towards one end under the hydraulic pressure of the high-pressure oil passage, overcoming the first control spring, and connecting the high-pressure oil passage with the control oil passage. The valve core can also move towards the other end under the elastic force of the first control spring, connecting the return oil passage with the control oil passage.

4. The compact micro excavator single-power control pump according to claim 3, characterized in that: The rocker arm is provided with a feedback rod, and the power control valve includes a valve sleeve and a second control spring. The feedback rod abuts against the valve sleeve and is limited, and the feedback rod can swing with the rocker arm. The second control spring can use its elastic force to cause the valve sleeve to move to the position where the power control valve is closed.

5. The compact micro-excavator single-power control pump according to claim 1, 2, 3, or 4, characterized in that: The rocker arm is provided with ball heads and sliding shoe seats at both ends. The ball heads are movably mounted on the sliding shoe seats, and the sliding shoe seats at both ends of the rocker arm are respectively connected to the control rod and the reset rod.

6. The compact micro excavator single-power control pump according to claim 1, 2, 3, or 4, characterized in that: A reset cylinder is provided at the other end of the pump housing corresponding to the rocker arm. The reset rod is slidably inserted into the reset cylinder, and a reset spring is provided between the reset rod and the reset cylinder.

7. The compact micro excavator single-power control pump according to claim 1, 2, 3, or 4, characterized in that: The drive shaft is provided with a top pin and a ball joint, and the cylinder body is provided with a cylinder spring. The ball joint is used to form a sliding contact with the inner hole of the rotating disk. The cylinder spring abuts against the top pin, and the cylinder spring can push the top pin elastically to cause the ball joint to press the rotating disk against the rocker arm.

Images