Patent Application
20240424657
The invention relates to a hand-held pulling and compression device and a hydraulic actuator for a hand-held pulling and compression device for driving hydraulic tools, with
Hand-held pulling and compression devices are known from the state of the art in a variety of configurations. In some of the known pulling and compression devices, the pulling and pressing tools that can be connected to the devices are adjusted by means of an electro-mechanical drive unit. Another group of pulling and compression devices provide hydraulic pressure to drive pulling and pressing tools designed as hydraulic tools. The hydraulic pressure can be generated, for example, by a compressed air drive, whereby a hydraulic pressure required for operating the hydraulic tools is generated by pneumatic adjustment of a pneumatic piston and a suitable transmission.
Due to the hydraulic pressure required for the use of hydraulic tools, it is not possible to connect them to purely electro-mechanical pulling and pressing devices. This incompatibility makes it necessary to have at least two adapted drive devices available if both electro-mechanically driven and hydraulically driven tools are required.
Based on this, the invention is based on the object of providing a hydraulic actuator for an electro-mechanically driven hand-held pulling and compression device and a hand-held pulling and compression device which makes it possible to drive hydraulic tools in addition to electro-mechanically driven pulling and pressing tools.
The invention solves the by a hydraulic actuator with the features of claim 1 and by a hand-held pulling and compression device with the features of claim 8. Advantageous further embodiments of the hydraulic actuator are given in claim 2 to 7.
For driving hydraulic tools, i.e. tools for the adjustment of which hydraulic pressure is required, the hydraulic actuator according to the invention has a working chamber filled with hydraulic fluid, which is delimited by an inner wall of a housing body and by an end surface, facing the working chamber, of a hydraulic piston arranged in the working chamber to be displaced between a starting position and an end position. To drive a hydraulic tool, the hydraulic actuator also has a hydraulic tool connection, which is connected to the working chamber via a hydraulic channel and is closed by a self-closing valve. An adjustment movement of the hydraulic piston from its starting position towards its end position thus generates hydraulic pressure, by means of which hydraulic tools connected to the hydraulic tool connection can be supplied.
A characteristic feature of the hydraulic actuator according to the invention is that
The design of the housing body with a connecting section allows the hydraulic actuator to be fixed in place on an electro-mechanically driven pulling and compression device so that it can be used to drive hydraulic tools. The hydraulic piston is reliably connected via its coupling section to a drive element that can be adjusted via the electro-mechanical drive, e.g. a tool holder of the pulling and compression device.
The fixed arrangement of the hydraulic actuator on the pulling and compression device and the connection of the drive element of the pulling and compression device to the hydraulic piston make it possible to reliably adjust the hydraulic piston between its starting position and its end position, so that the hydraulic actuator can be used to operate hydraulic tools connected to the hydraulic actuator by means of the electro-mechanical pulling and compression device. It is easy to switch between the connection option for hydraulic tools and electro-mechanically driven pulling and pressing tools by disassembling and assembling the hydraulic actuator.
In principle, the coupling section of the hydraulic piston can be connected to the drive element of the pulling and compression device in any desired manner, whereby in a simplest embodiment the drive element rests against the end surface of the hydraulic piston facing away from the working chamber. According to an advantageous embodiment of the invention, however, it is provided that the coupling section of the hydraulic piston is designed for positive connection with the drive element in the adjustment direction of the hydraulic piston. Such a positive connection ensures adjustment of the hydraulic piston by the drive element both in the direction of the end position and in the direction of the starting position. The positive connection can be designed, for example, in the form of a thread or bayonet lock, so that both tensile and compressive forces of the drive element can be transmitted to the hydraulic piston.
A connection between the hydraulic piston and the drive element of the pulling and compression device is essential for the function of the hydraulic actuator. For the connection, a connecting element can be provided on the hydraulic piston, for example, which can be connected to a drive element within the pulling or device. According to a particularly advantageous embodiment of the invention, however, it is provided that the coupling section of the hydraulic piston is designed for connection to a drive element of the pulling and compression device designed as a tool holder. The tool holder is usually a component arranged in sections on the end face of the pulling and compression device and connected to the electro-mechanical drive, which enables the pulling and pressing tools to be changed easily. The good accessibility required for this makes it particularly easy to connect the hydraulic piston of the hydraulic actuator to the tool holder, e.g. to bring it into contact. It is also possible to connect them in a form-fit manner so that the hydraulic piston is positively connected to the tool holder in both adjustment directions of the hydraulic piston.
The connection of the hydraulic actuator to the pulling and pressing device can in principle be designed in any way. According to a particularly advantageous embodiment of the invention, however, it is provided that the connecting section of the hydraulic actuator has a thread or latching bodies for detachable fixing to the connection section of the pulling and compression device having a thread or latching body receptacles. A corresponding embodiment of the invention enables a secure and easily detachable connection of the hydraulic actuator to the pulling and compression device without the need for further components and/or securing elements. To release the connection between the hydraulic actuator and the pulling and compression device, it is only necessary to unscrew it from the thread or to release the latching connection.
The design of the housing body is basically freely selectable. According to a particularly advantageous embodiment of the invention, however, it is provided that the housing body is multi-part, in particular two-part. In particular, a two-part design of the housing body allows the hydraulic actuator to be designed in such a way that it comprises a piston housing and a base body, whereby in this design the base body can be designed and connected to the piston housing in such a way that the base body rests against the hydraulic piston in sections in the starting position of the hydraulic piston and thus determines the starting position of the hydraulic piston in the housing body. The base body also serves to connect the hydraulic actuator to the pulling and compression device. A corresponding two-part design of the housing body thus allows not only simple assembly and disassembly on the pulling and compression device, but also simple assembly of the hydraulic actuator and, if necessary, simple maintenance.
In the simplest embodiment, a displacement of the hydraulic piston from the starting position to the end position can be ensured by a simple contact of the drive element on the end face of the hydraulic piston facing away from the working chamber. In order to ensure a return of the hydraulic piston for this case, according to a particularly advantageous further development of the invention, it is provided that the hydraulic piston is preloaded, in particular spring preloaded, in the direction of the starting position. This embodiment of the invention ensures that the hydraulic piston is reliably returned to its starting position without the need for further configurations of the hydraulic actuator.
According to a further embodiment of the invention, it is further provided that the hydraulic tool connection has a quick coupling. This enables the hydraulic tools that can be connected to the hydraulic actuator to be changed easily and conveniently. The self-closing valve reliably ensures that no hydraulic fluid escapes from the hydraulic actuator during a tool change. In addition, the hydraulic tool connection, in particular in conjunction with an advantageously provided design as a quick coupling, enables the connection to be used for refilling or filling the working chamber with hydraulic fluid.
The invention further solves the object by a hand-held pulling and compression device for driving interchangeable pulling and pressing tools with
In addition to the drive of mechanically driven pulling and pressing tools via the hydraulic actuator, the hand-held pulling and compression device according to the invention also enables the drive of hydraulic tools, whereby, if necessary, it is possible to switch between a drive of mechanically driven pulling and pressing tools and hydraulic tools in a simple manner by connecting or disconnecting the hydraulic actuator with the pulling and compression device.
An embodiment of the invention is explained below with reference to the drawings. The drawings show in:
Inside the piston housing 3, a hydraulic piston 6 is adjustable between a starting position shown in
Helical compression springs 11, which are supported at one end on the hydraulic piston 6 and at the other end on an inner surface of the piston housing 3 opposite the hydraulic piston 6 in the adjustment direction, are used to return the hydraulic piston 6 from the end position shown in
To connect the hydraulic actuator 1 to a tension and compression device 25 shown in
The pulling and compression device 25 has a drive unit 16 comprising an electric motor 17, by means of which a threaded spindle 20 of a screw drive 19 arranged in a housing body 18 can be driven. In addition to the threaded spindle 20, the screw drive 19 also has a threaded nut 21 arranged on the threaded spindle 20, said threaded nut 21 is mounted non-rotatably on the housing body 18. The threaded nut 21 is used to drive a tool holder in the form of a piston rod 22, which is mounted so as to be adjustable in the longitudinal axis direction of the threaded spindle 20, so that the hydraulic piston 6 can be adjusted in the direction of the hydraulic actuator 1 by means of the pulling and compression device 25 via the piston rod 22 as a drive element. The hydraulic piston 6 has a coupling section 10 on its end face facing the piston rod 22, so that movements of the piston rod 22 are reliably transmitted to the hydraulic piston 6. The piston rod 22 is connected to the threaded nut 21 via a detachably connected coupling unit 23, which at its end opposite the piston rod 22 rests against an end face of the threaded nut 21 facing away from the piston rod 22.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2023 116 740.5 | Jun 2023 | DE | national |
