JP2020180551A - Wireless control device for electric hydraulic pump, and electric hydraulic pump provided with the same - Google Patents

Abstract

To provide a wireless control device for an electric hydraulic pump, which can stably and safely control the electric hydraulic pump even when used outdoors or in a factory, and provide an electric hydraulic pump provided with the same.SOLUTION: A wireless control device for an electric hydraulic pump wirelessly controls the operation of the electric hydraulic pump. The wireless control device comprises a hand operation switch for a worker to operate the electric hydraulic pump, and a wireless control part which, on the basis of the operation signal transmitted from the hand operation switch, transmits control signals to a motor control part for controlling a motor of the electric hydraulic pump and to a valve control part for controlling a pressure release valve of the electric hydraulic pump. The hand operation switch and the wireless control part are configured to become capable of wireless communication by performing pairing. The wireless control part transmits a working signal for working the motor to the motor control part only while receiving an extension signal as the operation signal from the hand operation switch.SELECTED DRAWING: Figure 1

Description

The present invention relates to an ultra-high pressure (70 Mpa or more) electric hydraulic pump used in a hydraulic drive device such as a hydraulic cylinder, and in particular, an electric hydraulic pump and an electric hydraulic pump that can be operated by wireless control by wireless control. Regarding a wireless control device for operation.

Conventionally, ultra-high pressure (70Mpa or more) electro-hydraulic pumps used in hydraulic drive devices such as hydraulic cylinders are controlled by a hand-operated switch connected by wire in consideration of operational safety and stability. It has been done.

However, when the hand operation switch is wired, the degree of freedom of movement of the operator is reduced. For this reason, when operating the hydraulic drive system, it may be necessary for the observer who directly checks the hydraulic drive system and the operator who operates the electric hydraulic pump by the hand operation switch to work while communicating with each other. there were.

In addition, in order to operate the hydraulic drive system installed in a place where it is difficult for humans to enter, the electric hydraulic pump and the hydraulic drive device are connected and the connecting pipe filled with hydraulic oil is lengthened, or the electric hydraulic pressure is used. It is necessary to lengthen the cable that connects the pump and the hand operation switch. For this reason, not only the cost of the device as a whole increases, but also the handleability deteriorates.

Utility Model Registration No. 3152036 JP-A-2018-182488

Therefore, it is desired to wirelessly connect the electric hydraulic pump and the hand operation switch. However, when used outdoors or in a factory, for example, wireless control by unidirectional communication as disclosed in Patent Document 1 or wireless control by communication using a wireless LAN standardized by IEEE 802.11 is an obstacle. Wireless communication was interrupted due to the interruption of radio waves due to electromagnetic waves and the occurrence of disturbance due to electromagnetic noise, and stable use was not possible.

On the other hand, in Patent Document 2, radio waves in two frequency bands are used to control the machine to be operated by radio waves in one frequency band, and the operating state of the machine to be operated is controlled by radio waves in the other frequency band. A two-way communication system has been proposed to acquire.

In this two-way communication system, by using radio waves in two frequency bands, even if a communication error occurs in wireless communication that controls the machine, the operating state of the machine is monitored by radio waves in different frequency bands. The communication status can be checked on the operating terminal.

However, the communication status can only be confirmed, and the machine to be operated cannot be controlled stably and safely. For example, when a heavy object is lifted by a hydraulic jack, it can be used with confidence. It is not possible.

In view of this situation, the present invention provides a wireless control for an electric hydraulic pump that can stably and safely control the electric hydraulic pump even when used outdoors or in a factory, for example. It is an object of the present invention to provide an apparatus and an electric hydraulic pump equipped with the apparatus.

The present invention has been invented to solve the above-mentioned problems in the prior art, and includes, for example, the following aspects of the present invention.

A wireless control device for electric hydraulic pumps that wirelessly controls the operation of the electric hydraulic pump.
A hand operation switch for the operator to operate the electric hydraulic pump,
Wireless control that transmits control signals to the motor control unit that controls the motor of the electro-hydraulic pump and the valve control unit that controls the pressure release valve of the electro-hydraulic pump based on the operation signal transmitted from the hand operation switch. Department and
With
The hand operation switch and the wireless control unit are configured to enable wireless communication by pairing.
The wireless control unit is configured to transmit an operation signal for operating the motor to the motor control unit only while receiving an extension signal as the operation signal from the hand operation switch. Wireless control device for electric hydraulic pumps.

Item [1] The wireless control unit is configured to transmit a stop signal for stopping the motor to the motor control unit when the extension signal is not received from the hand operation switch. The wireless control device for an electric hydraulic pump described in.

Item [1] The wireless control unit is configured to transmit a stop signal for stopping the motor to the motor control unit when the pairing with the hand operation switch is released. Alternatively, the wireless control device for an electric hydraulic pump according to [2].

The valve control unit is configured to control the pressure release valve to be in the open state only while receiving the release signal as the control signal.
The wireless control unit is configured to transmit an open signal as the control signal to the valve control unit only while the contraction signal is received as the operation signal from the hand operation switch. The wireless control device for an electric hydraulic pump according to any one of [1] to [3].

The hydraulic pump body that applies hydraulic pressure to the hydraulic oil and
The motor that operates the hydraulic pump body and
A pressure release valve for releasing the hydraulic pressure of the hydraulic oil and
An electric hydraulic pump comprising the wireless control device for the electric hydraulic pump according to any one of items [1] to [4].

Item [5], further comprising a pressure switch that transmits a forced stop signal for forcibly stopping the motor to the motor control unit when the hydraulic pressure of the hydraulic oil reaches a preset predetermined pressure. The electric hydraulic pump described in.

According to the present invention, since the paired hand operation switch and the electrohydraulic pump communicate wirelessly, one-to-one communication can be performed without worrying about crosstalk. In addition, since the electric hydraulic pump is operated only while the extension signal from the hand operation switch is being received by the electric hydraulic pump, radio waves may be blocked by obstacles or disturbances may occur due to electromagnetic noise. Even if the radio communication is interrupted due to the occurrence, the electric hydraulic pump is stopped and the state of the hydraulic drive device is maintained. Therefore, for example, even when a hydraulic jack using a single-acting hydraulic cylinder 50 is used to raise a heavy object, the safety is ensured without the heavy object being unintentionally lowered. be able to.

FIG. 1 is a schematic view showing an example of an electric hydraulic pump provided with a wireless control device for an electric hydraulic pump of the present invention. FIG. 2 is a schematic diagram for explaining the operation of the wireless control device for the electrohydraulic pump of FIG.

Hereinafter, embodiments (examples) of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a schematic view showing an example of an electric hydraulic pump provided with the wireless control device for an electric hydraulic pump of the present invention, and FIG. 2 is a schematic view for explaining the operation of the wireless control device for an electric hydraulic pump of FIG. Is.

As shown in FIGS. 1 and 2, the electric hydraulic pump 10 in the present embodiment operates an oil tank 12 in which hydraulic oil is stored, a hydraulic pump main body 14 for sucking and discharging hydraulic oil, and a hydraulic pump main body 14. Operation of the motor 16 to be operated, the pressure switch 18 that detects the hydraulic pressure of the hydraulic oil and outputs a stop signal at a predetermined pressure, the pressure release valve 20 for releasing the hydraulic pressure of the hydraulic oil, and the motor 16 and the pressure release valve 20. 22 is provided.

Further, as shown in FIG. 1, the electric hydraulic pump 10 is connected to the single-acting hydraulic cylinder 50, which is a hydraulic drive device, via a connection pipe 24. In the present embodiment, the hydraulic drive device will be described as an example of the single-acting hydraulic cylinder 50, but a double-acting hydraulic cylinder may be used.

The hydraulic pump main body 14 in the present embodiment is not particularly limited as long as it can be operated by the motor 16, and for example, a gear pump, a vane pump, a plunger pump, or the like can be used.

The motor 16 is connected to a power source (not shown) and operates by electric power supplied from the power source. The motor 16 is not particularly limited, and a known motor can be used.

By the operation of the motor 16, the hydraulic pump main body 14 sends the hydraulic oil from the oil tank 12 in the direction of the connecting pipe 24, thereby increasing the hydraulic pressure of the hydraulic oil. As a result, the single-acting hydraulic cylinder 50 is extended.

The pressure switch 18 is not particularly limited as long as it outputs a predetermined signal when the hydraulic pressure of the hydraulic oil reaches a preset predetermined pressure, and the pressure switch 18 is a known pressure switch 18. Can be used. In the present embodiment, the pressure switch 18 is configured to output a forced OFF signal to the control device 22.

The pressure release valve 20 has a mechanism capable of controlling opening and closing by a signal such as a solenoid valve, and the hydraulic oil returns from the connecting pipe 24 to the oil tank 12 by a signal from the control device 22 and operates. The oil pressure is released. As a result, the single-acting hydraulic cylinder 50 is contracted by a spring or the like provided inside.

The control device 22 transmits a control signal to the motor control unit 22a that controls the on / off of the motor 16, the valve control unit 22b that controls the opening / closing of the pressure release valve 20, the motor control unit 22a, and the valve control unit 22b. It has a wireless control unit 22c and the like. As will be described later, the wireless control unit 22c receives an operation signal transmitted from the wirelessly connected hand operation switch 30, and transmits a control signal to the motor control unit 22a and the valve control unit 22b based on the operation signal. ..

In the present embodiment, as shown in FIGS. 1 and 2, the wireless control unit 22c and the hand operation switch 30 are referred to as a wireless control device 40 for an electric hydraulic pump (hereinafter, simply referred to as “wireless control device 40”). ) Is configured.

The hand operation switch 30 is connected to the wireless control unit 22c by wireless communication. Further, the hand operation switch 30 is provided with one or more buttons (extension button 32 and contraction button 34 in this embodiment), and as will be described later, by pressing the respective buttons 32 and 34, wirelessly It is configured to transmit an operation signal to the control unit 22c.

It is preferable that such a hand operation switch 30 is configured to be operated by a battery such as a dry battery or a secondary battery, for example.

The wireless communication for connecting the hand operation switch 30 and the wireless control unit 22c is particularly limited as long as it is a method that is less affected by disturbances such as electromagnetic noise and is not easily blocked by obstacles. Although not, it is preferable to use the communication method standardized by ARIB STD-T66.

In particular, it is preferable to adopt a spread spectrum communication method such as frequency hopping. Further, it is preferable to adopt a two-way communication method so that the communication status can be confirmed. Further, it is preferable that the cyclic redundancy check enables error detection of the transmitted / received signal.

Further, it is preferable that the hand operation switch 30 and the wireless control unit 22c are paired to enable wireless communication. With such a configuration, it is possible to prevent an unintended hydraulic drive device from operating.

As such a hand operation switch 30 and a wireless control unit 22c, for example, 2.4 GHz band wireless remote control systems KSR 2.4W and KSR 2.4 manufactured by Circuit Design Co., Ltd. can be used.

As shown in FIG. 2, in the wireless control device 40, the hand operation switch 30 and the wireless control unit 22c are wirelessly connected, and the hand operation can be performed by pressing the buttons 32 and 34 provided on the hand operation switch 30. An operation signal is transmitted from the switch 30 to the wireless control unit 22c.

The wireless control unit 22c that has received the operation signal transmits the control signal to the motor control unit 22a and the valve control unit 22b based on the operation signal. The motor control unit 22a controls the operation of the motor 16 based on the control signal, so that the hydraulic pump main body 14 operates. Further, the valve control unit 22b controls the opening and closing of the pressure release valve 20 based on the control signal.

Specifically, when the extension button 32 of the hand operation switch 30 is pressed, the extension signal is transmitted from the hand operation switch 30 to the wireless control unit 22c as an operation signal. When the wireless control unit 22c receives the extension signal, it transmits an operation signal as a control signal to the motor control unit 22a in order to extend the single-acting hydraulic cylinder 50. As a result, the motor 16 operates, the hydraulic pump main body 14 operates, the hydraulic oil is pressurized, and the single-acting hydraulic cylinder 50 expands.

When the extension button 32 of the hand operation switch 30 is released, the operation signal from the hand operation switch 30 is stopped. When the wireless control unit 22c stops receiving the extension signal, the wireless control unit 22c transmits a stop signal as a control signal to the motor control unit 22a in order to stop the motor 16. As a result, the motor 16 is stopped and the hydraulic pump main body 14 is also stopped. At this time, since the pressure applied to the hydraulic oil is maintained, the state of the single-acting hydraulic cylinder 50 is maintained.

In this way, by configuring the extension button 32 of the hand operation switch 30 to operate momentarily, the hydraulic pump body 14 can be stopped instantly when the extension button 32 is released, ensuring safety. be able to. The extension button 32 of the hand operation switch 30 may be configured to operate in an alternate manner.

Further, by configuring the hydraulic pump body 14 so that the hydraulic pressure of the hydraulic oil is maintained and the state of the single-acting hydraulic cylinder 50 is maintained when the hydraulic pump main body 14 is stopped, for example, a hydraulic jack using the single-acting hydraulic cylinder 50 is used. Therefore, even when the work of raising a heavy object is performed, the safety can be ensured without unintentionally lowering the heavy object.

Further, when the single-acting hydraulic cylinder 50 extends to a predetermined stroke, that is, when the hydraulic pressure reaches a predetermined pressure, the pressure switch 18 transmits a forced stop signal to the motor control unit 22a. When the motor control unit 22a receives the forced stop signal, the motor 16 is stopped and the hydraulic pump main body 14 is stopped even when the extension signal is received as the operation signal. It is preferable that the motor control unit 22a is configured to stop the motor 16 by stopping the energization of the motor 16 when the forced stop signal is received.

On the other hand, when the contraction button 34 of the hand operation switch 30 is pressed, the contraction signal is transmitted from the hand operation switch 30 to the wireless control unit 22c as an operation signal. Upon receiving the contraction signal, the wireless control unit 22c transmits an release signal as a control signal to the valve control unit 22b in order to contract the single-acting hydraulic cylinder 50. As a result, the valve control unit 22b opens the pressure release valve 20, the hydraulic pressure of the hydraulic oil is released, and the single-acting hydraulic cylinder 50 contracts.

When the contraction button 34 of the hand operation switch 30 is released, the operation signal from the hand operation switch 30 is stopped. When the wireless control unit 22c stops receiving the release signal, the wireless control unit 22c stops transmitting the signal to the valve control unit 22b. As a result, the valve control unit 22b closes the pressure release valve 20, stops the release of the hydraulic pressure of the hydraulic oil, and stops the contraction of the single-acting hydraulic cylinder 50.

It is preferable that the valve control unit 22b is configured to control the pressure release valve 20 so as to be in the open state only while the release signal is received as the control signal. With this configuration, the hydraulic pressure of the hydraulic oil is not released and the state of the single-acting hydraulic cylinder 50 is maintained unless an release signal is received. For example, the single-acting hydraulic cylinder 50 is used. Even when a hydraulic jack is used to raise a heavy object, safety can be ensured without unintentionally dropping the heavy object.

Like the extension button 32, the contraction button 34 of the hand operation switch 30 may be configured to operate momentarily, or may be configured to operate alternately.

In this embodiment, the pressure release valve 20 is opened only while the contraction button 34 of the hand operation switch 30 is pressed to transmit the release signal as the operation signal to the wireless control unit 22c. However, by pressing the contraction button 34 of the hand operation switch 30 once, the pressure release valve 20 can be opened and the hydraulic pressure of the hydraulic oil can be returned to the initial state.

In addition, in the unlikely event that the wireless communication between the hand operation switch 30 and the wireless control unit 22c is cut off, or the battery of the hand operation switch 30 runs out, the wireless control unit 22c and the hand operation switch 30 When the pairing of the above is released, the wireless control unit 22c does not transmit a stop signal as a control signal to the motor control unit 22a and further, does not transmit an open signal as a control signal to the valve control unit 22b. It is configured. With this configuration, for example, even when a hydraulic jack using a single-acting hydraulic cylinder 50 is used to raise a heavy object, the heavy object does not unintentionally drop. Safety can be guaranteed.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this. For example, in the above embodiment, a single-acting hydraulic cylinder is given as an example as a hydraulic drive device. Even for hydraulic cylinders and the like, various changes can be made without departing from the object of the present invention, such as being applicable by appropriately changing the structure and control of the hydraulic pump by known means and methods.

10 Electric hydraulic pump 12 Oil tank 14 Hydraulic pump body 16 Motor 18 Pressure switch 20 Pressure release valve 22 Control device 22a Motor control unit 22b Valve control unit 22c Wireless control unit 24 Connection piping 30 Hand operation switch 32 Extension button 34 Contraction button 40 Electric Wireless control device for hydraulic pump 50 Single-acting hydraulic cylinder

Claims (6)

A wireless control device for electric hydraulic pumps that wirelessly controls the operation of the electric hydraulic pump.
A hand operation switch for the operator to operate the electric hydraulic pump,
Wireless control that transmits control signals to the motor control unit that controls the motor of the electro-hydraulic pump and the valve control unit that controls the pressure release valve of the electro-hydraulic pump based on the operation signal transmitted from the hand operation switch. Department and
With
The hand operation switch and the wireless control unit are configured to enable wireless communication by pairing.
The wireless control unit is configured to transmit an operation signal for operating the motor to the motor control unit only while receiving an extension signal as the operation signal from the hand operation switch. Wireless control device for electric hydraulic pumps. According to claim 1, the wireless control unit is configured to transmit a stop signal for stopping the motor to the motor control unit when the extension signal is not received from the hand operation switch. The wireless control device for an electric hydraulic pump described. The wireless control unit is configured to transmit a stop signal for stopping the motor to the motor control unit when the pairing with the hand operation switch is released. 2. The wireless control device for an electric hydraulic pump according to 2. The valve control unit is configured to control the pressure release valve to be in the open state only while receiving the release signal as the control signal.
The wireless control unit is configured to transmit an open signal as the control signal to the valve control unit only while the contraction signal is received as the operation signal from the hand operation switch. Item 4. The wireless control device for an electric hydraulic pump according to any one of Items 1 to 3. The hydraulic pump body that applies hydraulic pressure to the hydraulic oil and
The motor that operates the hydraulic pump body and
A pressure release valve for releasing the hydraulic pressure of the hydraulic oil and
An electric hydraulic pump comprising the wireless control device for an electric hydraulic pump according to any one of claims 1 to 4. The fifth aspect of claim 5 further comprises a pressure switch that transmits a forced stop signal for forcibly stopping the motor to the motor control unit when the hydraulic pressure of the hydraulic oil reaches a preset predetermined pressure. The described electric hydraulic pump.

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