阅读说明：本技术 一种交直流两用劈柴机 (AC/DC dual-purpose firewood chopping machine ) 是由 刘楷 储玉凯 曾玉山 唐以刚 陈林淼 林有余 于 2021-09-13 设计创作，主要内容包括：本发明公开了一种交直流两用劈柴机,包括动力工作部和供电模块,动力工作部包括机架、连接在机架上的固定刀头和液压推杆,液压推杆的输出端连接有活动刀头,机架上还连接有电机；供电模块通过固定支架连接在机架上,供电模块包括电池包组、交流插头以及和电机相连接的控制器,当电池包组和控制器连接时,控制器将电池包组提供的直流电传递至电机；当交流插头连接的交流电源和控制器连接时,控制器用于将交流电源的电压转换恒定的直流电压后传递至电机；电机驱动高压油泵以带动液压推杆上连接的活动刀头运动完成劈柴。本申请可采用小于60V的电池包组供电,并可将交流电转换成直流电,保证了劈柴工作的安全性。(The invention discloses an alternating current-direct current dual-purpose firewood splitting machine, which comprises a power working part and a power supply module, wherein the power working part comprises a rack, a fixed cutter head and a hydraulic push rod, the fixed cutter head and the hydraulic push rod are connected to the rack; the power supply module is connected to the rack through the fixed support and comprises a battery pack group, an alternating current plug and a controller connected with the motor, and when the battery pack group is connected with the controller, the controller transmits direct current provided by the battery pack group to the motor; when an alternating current power supply connected with the alternating current plug is connected with the controller, the controller is used for converting the voltage of the alternating current power supply into constant direct current voltage and transmitting the constant direct current voltage to the motor; the motor drives the high-pressure oil pump to drive the movable cutter head connected to the hydraulic push rod to move to finish firewood chopping. The power supply can be realized by adopting the battery pack set with the voltage less than 60V, and the alternating current can be converted into the direct current, so that the safety of the firewood chopping work is ensured.)

1. The alternating current-direct current dual-purpose firewood chopping machine is characterized by comprising a power working part (3) and a power supply module (1), wherein the power working part comprises a rack, a fixed cutter head (35) and a hydraulic push rod (33) which are connected to the rack, the output end of the hydraulic push rod (33) is connected with a movable cutter head (34), and the rack is also connected with a motor (31);

the power supply module (1) is connected to the rack through a fixing support (2), the power supply module (1) comprises a battery pack group, an alternating current plug (17) and a controller (11) connected with a motor (31), and the output voltage of the battery pack group is smaller than 60V;

when the battery pack is connected with the controller (11), the controller (11) transmits the direct current provided by the battery pack to the motor (31); when an alternating current power supply connected with the alternating current plug (17) is connected with a controller, the controller (11) is used for converting the voltage of the alternating current power supply into a constant direct current voltage and transmitting the constant direct current voltage to the motor (31);

the motor (31) drives the high-pressure oil pump (32) to drive the movable tool bit (34) connected to the hydraulic push rod (33) to move to finish wood chopping.

2. The AC/DC firewood chopping machine according to claim 1, wherein the controller (11) is provided with a power selection module, and when the AC power supply connected with the battery pack and the AC plug (17) is connected with the controller (11), the power selection module selects the AC power supply connected with the AC plug (17) to supply power to the motor (31).

3. The AC/DC firewood chopping machine according to claim 1, wherein when the AC power supply connected with the battery pack and the AC plug (17) is connected with the controller (11), the controller (11) is used for controlling the AC power supply connected with the AC plug (17) to charge the battery pack.

4. The AC/DC firewood chopper according to claim 1, wherein the motor (31) is a DC brushless motor or a dual voltage winding brushless motor.

5. The AC/DC firewood chopping machine according to claim 1, wherein the battery pack comprises one battery pack (13) or a plurality of battery packs (13) connected in series or a plurality of battery packs (13) connected in parallel.

6. The AC/DC firewood chopper as claimed in claim 1, wherein the normal operating current of the battery pack set is 50A, the battery pack set is provided with a primary current protection and a secondary current protection, the current interval of the primary current protection is 50-60A, and the current interval of the secondary current protection is 70-80A.

7. The DC log splitter as claimed in claim 6, wherein the controller (11) sets the maximum discharge current for a continuous output time not less than 2 s.

8. The direct current firewood chopping machine according to claim 1, characterized in that a signal switch (12) is further connected to the controller (11), and the signal switch (12) is used for controlling the motor (31) to be powered on and off.

9. The direct current firewood chopping machine of claim 1, wherein one or more of an overcharge protection module, an overdischarge protection module, a charge-discharge short circuit protection module and an overheat protection module are arranged in the battery pack group.

10. The direct current firewood chopping machine according to claim 1, characterized in that the power supply module (1) comprises a battery pack group and a battery compartment cover, the battery pack group is detachably connected in the battery compartment cover, and the battery compartment cover is connected with the fixed support (2).

Technical Field

The invention relates to the technical field of wood splitting machines, in particular to an alternating current and direct current dual-purpose wood splitting machine.

Background

Most of the current market firewood splitting machines can only be connected with alternating current commercial power of not less than 100V to work, and the working range is limited by the length of a cable and has certain limitation. In addition, the technical requirements of the low-voltage direct-current wood splitting machine are higher compared with the traditional low-voltage tool. How to make heavy current persistence discharge by the battery pack, how to select reliable power devices by the controller to meet the high-power requirement of the wood splitting machine, how to set the overload protection parameters of the controller and other technical key points, and the design difficulty of the low-voltage direct-current wood splitting machine is invisibly promoted by integrating the technical key points.

Disclosure of Invention

The invention aims to provide an alternating current and direct current dual-purpose wood splitting machine, which solves the problems that the safety of the wood splitting machine using high-voltage commercial power is poor and the working range of the commercial power connected by a connecting cable is restricted in the prior art.

In order to achieve the purpose, the invention is realized by adopting the following technical scheme:

an alternating current and direct current dual-purpose firewood splitting machine comprises a power working part and a power supply module, wherein the power working part comprises a rack, a fixed cutter head and a hydraulic push rod, the fixed cutter head and the hydraulic push rod are connected to the rack, the output end of the hydraulic push rod is connected with a movable cutter head, and the rack is also connected with a motor;

the power supply module is connected to the rack through a fixed support and comprises a battery pack group, an alternating current plug and a controller connected with the motor, wherein the output voltage of the battery pack group is less than 60V;

when the battery pack group is connected with the controller, the controller transmits the direct current provided by the battery pack group to the motor; when the alternating current power supply connected with the alternating current plug is connected with the controller, the controller is used for converting the voltage of the alternating current power supply into constant direct current voltage and transmitting the constant direct current voltage to the motor;

the motor drives the high-pressure oil pump to drive the movable cutter head connected to the hydraulic push rod to move to finish wood splitting.

Further, the controller is provided with a power supply selection module, and when the battery pack group and the alternating current power supply connected with the alternating current plug are both connected with the controller, the power supply selection module selects the alternating current power supply connected with the alternating current plug to supply power to the motor.

Further, when the battery pack group and the alternating current power supply connected with the alternating current plug are both connected with the controller, the controller is used for controlling the alternating current power supply connected with the alternating current plug to charge the battery pack group.

Further, the motor is a direct current brushless motor or a dual voltage winding brushless motor.

Further, the battery pack group comprises one battery pack or a plurality of battery packs connected in series or a plurality of battery packs connected in parallel.

Further, the normal working current of the battery pack group is 50A, the battery pack group is provided with primary current protection and secondary current protection, the current interval of the primary current protection is 50-60A, and the current interval of the secondary current protection is 70-80A.

Further, the controller sets the continuous output time of the maximum discharge current to be not less than 2 s.

Furthermore, the controller is also connected with a signal switch, and the signal switch is used for controlling the on-off of the motor.

Furthermore, the battery pack group is internally provided with one or more of an overcharge protection module, an overdischarge protection module, a charge-discharge short-circuit protection module and an overtemperature protection module.

Furthermore, the power supply module comprises a battery pack group and a battery compartment cover, the battery pack group is detachably connected in the battery compartment cover, and the battery compartment cover is connected with the fixed support.

According to the technical scheme, the embodiment of the invention at least has the following effects:

1. the electric wood chopping machine is provided with two power supply modes of a battery pack group and alternating current commercial power, and is provided with a controller, when the battery pack group with the output voltage smaller than 60V supplies power, the controller drives a motor to work to complete wood chopping, when the alternating current commercial power supplies power, the controller converts alternating current of the alternating current commercial power into direct current and outputs the direct current to the motor to complete wood chopping, the battery pack group with the output voltage smaller than 60V supplies power, the alternating current can be converted into the direct current, and the safety of wood chopping work is guaranteed;

2. this application has designed battery package group and alternating current plug, and when the firewood machine was in alternating current power supply working range, alternating current plug connected alternating current power supply was in order to accomplish the work of splitting firewood, and when the firewood machine was far away from alternating current power supply scope, the battery package group was supplied power in order to accomplish the work of splitting firewood to the motor, had improved the firewood machine suitability, had solved the problem of the difficult firewood of splitting when the firewood machine was far away from alternating current power supply.

Drawings

FIG. 1 is a schematic structural view of a log splitter according to an embodiment of the present invention;

FIG. 2 is a schematic view of a connection structure of a power supply module and a power working part according to an embodiment of the present invention;

FIG. 3 is a schematic view of the main structure of the power working part according to the embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a power supply module according to an embodiment of the present invention;

FIG. 5 is a block diagram of the DC power supply principle of the present invention;

fig. 6 is a schematic block diagram of ac power supply in accordance with an embodiment of the present invention.

Wherein: 1. a power supply module; 11. a controller; 12. a signal switch; 13. a battery pack; 14. a pin; 15. an upper cover of the battery compartment; 16. a lower cover of the battery compartment; 17. an AC plug; 2. fixing a bracket; 3. a power working section; 31. a motor; 32. a high-pressure oil pump; 33. a hydraulic push rod; 34. a movable tool bit; 35. and (5) fixing the cutter head.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

It should be noted that in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. As used in the description of the present invention, the terms "front," "back," "left," "right," "up," "down" and "in" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

The invention aims to weaken the restriction of the length of a cable by using two power supply modes of a direct current power supply and an alternating current commercial power supply below 60V, so that the wood splitting machine has wider application range and is safer.

As shown in fig. 1 to 6, an ac/dc dual-purpose firewood chopper comprises a power working part 3 and a power supply module 1, wherein the power working part comprises a frame, a fixed cutter head 35 and a hydraulic push rod 33 which are connected to the frame, the output end of the hydraulic push rod 33 is connected with a movable cutter head 34, and the frame is also connected with a motor 31; the power supply module 1 is connected to the rack through the fixing support 2, the power supply module 1 comprises a battery pack, an alternating current plug 17 and a controller 11 connected with a motor 31, wherein the output voltage of the battery pack is less than 60V; when the battery pack group is connected to the controller 11, the controller 11 transmits the direct current supplied from the battery pack group to the motor 31; when the alternating current power supply connected with the alternating current plug 17 is connected with the controller, the controller 11 is used for converting the voltage of the alternating current power supply into constant direct current voltage and transmitting the constant direct current voltage to the motor 31; the motor 31 drives the high-pressure oil pump 32 to drive the movable cutter head 34 connected to the hydraulic push rod 33 to move so as to finish wood splitting.

The utility model provides an adopt two kinds of power supply modes of battery package group and alternating current commercial power to set up the controller, when output voltage is less than 60V's battery package group power supply, the controller drives motor work and accomplishes the firewood chopping, when alternating current commercial power supply, the controller converts alternating current of alternating current commercial power into direct current output to the motor and accomplishes the firewood chopping, this application can adopt the battery package group power supply that is less than 60V, and can convert alternating current into direct current, the security of the work of chopping the firewood has been guaranteed.

This application has designed battery package group and alternating current plug, and when the firewood machine was in alternating current power supply working range, alternating current plug connected alternating current power supply was in order to accomplish the work of splitting firewood, and when the firewood machine was far away from alternating current power supply scope, the battery package group was supplied power in order to accomplish the work of splitting firewood to the motor, had improved the firewood machine suitability, had solved the problem of the difficult firewood of splitting when the firewood machine was far away from alternating current power supply.

The specific structure of the wood splitting machine is shown in fig. 1 to 4, and the wood splitting machine comprises a power working part 3, wherein the power working part 3 comprises a frame, and the top surface of the frame is provided with a fixed cutter head 35 and a movable cutter head 34 which is positioned on the same straight line with the fixed cutter head 35. The fixed cutter head 35 is fixedly connected to the frame, and the movable cutter head 34 is connected with the output end of the hydraulic push rod 33 in the frame. The hydraulic push rod 33 works to drive the movable cutter head 34 to move towards the reverse direction close to or far away from the fixed cutter head 35 to finish wood splitting.

Specifically, when the movable cutter head 34 is far away from the fixed cutter head 35, wood can be placed on the rack, and the hydraulic push rod 33 works to drive the movable cutter head 34 to be close to the fixed cutter head 35, so that the wood can be split.

The fixed cutter head 35 and the movable cutter head 35 are positioned on the same straight line, so that the effect and the quality of wood chopping are ensured.

The power supply module 1 is connected to the bottom surface of the frame, and the power supply module 1 is connected with the hydraulic push rod 33 and used for driving the hydraulic push rod 33 to work. Specifically, the power supply module 1 drives the direct current motor 31 to work, the direct current motor 31 drives the high-pressure oil pump 32 to work, and the high-pressure oil pump 32 drives the hydraulic push rod 33 to stretch and retract so as to complete the firewood chopping action.

In some embodiments, the power supply module 1 includes a battery compartment upper cover 15 and a battery compartment lower cover 16 for connecting the battery pack 13, the battery compartment upper cover 15 is connected with the fixing bracket 2 on the rack through a bolt, the battery pack 13 is placed in the battery compartment lower cover 16, and the battery compartment lower cover 16 and the battery compartment upper cover 15 are connected through a plug-in connection or a screw connection.

The access of the controller 11 to the battery pack and the ac mains supply will be described separately below.

When the battery pack group is accessed, the battery pack group may be one battery pack, may be a plurality of battery packs connected in series, or may be a plurality of battery packs 13 connected in parallel. The output voltage of the battery pack is required to be not higher than 60V no matter how many battery packs the battery pack group is composed of.

The battery pack 13 is also provided with 2-level high-current protection, the setting interval of the first-level current is 50-60A, and the setting interval of the second-level protection current is 70-80A. Under the room temperature environment, the battery pack can support continuous constant current discharge of 50A, and the continuous discharge time is not less than 50 s.

Furthermore, the discharging current of the battery pack is collected through the internal software of the control board inside the battery pack, and when the discharging current reaches the threshold value of the secondary overcurrent protection, the main discharging loop is cut off.

Further, the battery pack can continuously discharge 50A for 50s at room temperature by selecting a battery core capable of discharging large current and matching with an MOS (metal oxide semiconductor) tube with large overcurrent capacity.

In some embodiments, the battery pack 13 itself is provided with basic safety protection settings for overcharge, overdischarge, charge-discharge short circuits, over-temperature, and the like. Overcharge protection, overdischarge protection, charge-discharge short-circuit protection, over-temperature protection and the like can be realized by adopting the conventional circuit.

Furthermore, software of a control board inside the battery pack can detect charging voltage, current, discharging voltage and discharging current of the battery pack, corresponding charging and discharging current and voltage threshold values are set, when the corresponding starting threshold values are reached, active intervention is conducted on charging and discharging of the battery pack so as to achieve corresponding protection, and meanwhile, temperature sensors are arranged at multiple positions inside the battery pack so as to achieve the functions of temperature detection and over-temperature protection under the working state of the battery pack.

In some embodiments, depending on the hardware and software protection settings of the battery pack 13 and the controller 11, the hardware design of the controller 11 may normally pass a high current with an upper limit not lower than the secondary protection current value of the battery pack (the controller may normally operate at a current of at least 80A). The software sets the protection current of the controller which is not higher than the primary protection current of the battery pack according to the requirement of the actual power working part (the controller works under the current which is less than or equal to 50A), ensures that mutual constraint is formed between the battery pack 13 and the controller 11, and avoids long-time heavy current discharge from influencing the service life of the battery pack 13, the controller 11 and the direct current motor 31.

The controller 11 sets the overload protection current limit value and the continuous discharge time of the maximum current according to the hardware protection parameters of the battery pack 13 and by combining the actual working state of the wood splitting machine. Because the highest load of the wood splitting machine is usually in the transient process that the wood is subjected to pressure and is not split, the maximum current-limiting continuous discharge time of the controller 6 is set to be not less than 2-5 s according to the load characteristic, and the wood splitting machine is ensured to have sufficient time to complete the action of splitting the wood instantly.

Further, the maximum current limit can be set before leaving the factory according to the whole load of the wood splitting machine, for example, 40A and 50A are set, the upper limit of the maximum working load of the corresponding wood splitting machine is high or low, the load design of the controller 11 does not exceed the maximum bearing capacity of the hardware of the controller in principle, in order to achieve the discharge capacity of 2-5S of the maximum current limit, for the controller, power devices such as an MOS tube with high overcurrent capacity are selected to ensure the maximum current limit discharge for a certain time, and the discharge time of 2-5S is set according to the working characteristics of the wood splitting machine, so that the situation that the cost is increased due to the overhigh performance of the hardware of the controller can be avoided.

The signal switch 12 is connected to the controller 11 for controlling the power on/off of the power working unit 3. The direct current voltage output by the battery pack 13 through the pin 14 does not exceed 60V. The direct current motor 31 drives the high-pressure oil pump 32 to work, the hydraulic push rod 33 is pushed to move, the movable cutter head 34 is connected with the hydraulic push rod 33, the movable cutter head 34 pushes the firewood to extrude the fixed cutter head 35, and the firewood chopping action is completed.

When the alternating current commercial power is connected, in a working state, the power supply selection module in the controller 11 can automatically switch to alternating current power supply, realize voltage transformation rectification through the controller 11 and output constant direct current voltage which is not higher than 60V.

Furthermore, the power supply selection module comprises devices with a circuit breaking function such as an MOSFET, an IGBT, a silicon controlled rectifier, a relay and the like and a driving circuit thereof, and is provided with an online circuit for independently detecting the alternating current input source and the direct current input source, and the power supply input mode is automatically detected and switched through preset logic.

The continuous output time of the DC maximum current 50A set by the controller 6 is not less than 2-5 s, and the DC brushless motor 16 is driven to work. When the battery pack 1 and the alternating current commercial power are both connected, the wood splitting machine can work and charge the battery pack 1, and when the battery is fully charged or reaches a charge cut-off voltage value, the charging state is cut off.

In this embodiment, the adopted motor is a dc brushless motor, and the commercial power is rectified by a controller to output a constant dc voltage not higher than 60V, so as to drive the dc brushless motor to work. The battery pack directly drives the DC brushless motor to work.

Specifically, the alternating current power supply is controlled to be not higher than 60V direct current voltage by the mains supply through the modes of firstly reducing voltage and then rectifying or firstly rectifying and then reducing voltage.

For the mode of firstly reducing voltage and then rectifying, generally, the mode of carrier wave or transformer is adopted to firstly reduce the alternating voltage to be lower, and then the direct voltage which is not higher than 60V is output through the rectifying and filtering circuit.

For the mode of rectifying first and then reducing voltage, half-wave or full-wave rectifying and filtering are generally used to output higher direct current voltage, and the direct current voltage not higher than 60V is output by a DCDC voltage reduction circuit.

Example 2

This embodiment is basically the same as embodiment 1, and the same parts thereof will not be discussed repeatedly, and the present embodiment is different from embodiment 1 in that the controller is not provided with a function of charging the battery pack when both the battery pack group and the ac commercial power are connected. The controller selects alternating current commercial power to supply power to the motor.

Example 3

This embodiment is basically the same as embodiment 1, and the same parts thereof will not be discussed repeatedly, and the difference between this embodiment and embodiment 1 is that the dual-voltage winding brushless motor is adopted in this embodiment, and the commercial power is rectified by the controller to output a set constant dc voltage (not more than 60V) to drive the dual-voltage winding brushless motor to operate.

It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.