Handheld traction and pressure device and hydraulic actuator

Abstract

The invention relates to a handheld pulling and pushing device and a hydraulic actuator for a handheld pulling and pushing device for driving hydraulic tools, comprising a housing body having a working chamber filled with hydraulic fluid, a hydraulic piston arranged to be displaceable in the working chamber between a starting position and an end position and a hydraulic tool connection with a hydraulic channel connected to the working chamber and having a self-closing valve.In order to provide a hydraulic actuator for an electro-mechanically driven handheld pulling and pushing device, as well as a handheld pulling and pushing device which makes it possible to drive hydraulic tools in addition to electro-mechanically driven pulling and pressing tools, it is provided that the housing body of the hydraulic actuator has a connecting section for the detachable fixing of the hydraulic actuator to a connection section of the pulling and pushing device, and the hydraulic piston has a coupling section for connection with a drive element of the pulling and pushing device that is adjustable relative to the connection section.

Description

[0001] The invention relates to a handheld pulling and pushing device and a hydraulic actuator for a handheld pulling and pushing device for driving hydraulic tools, with a housing body having a working chamber filled with hydraulic fluid, a hydraulic piston arranged to be displaceable in the working chamber between a starting position and an end position and a hydraulic tool connection with a hydraulic channel connected to the working chamber and having a self-closing valve.

[0002] Such a hydraulic actuator is shown in document DE 10 2021 107120 A1.

[0003] Handheld pulling and pushing devices are known in various forms from the prior art. In some of these known devices, the drawing and pressing tools that can be connected to the devices are adjusted by means of an electromechanical drive unit. Another group of pulling and pushing devices provides hydraulic pressure to drive drawing and pressing tools designed as hydraulic tools. The hydraulic pressure can be generated, for example, by a compressed air drive, whereby a pneumatic adjustment of a pneumatic piston and a suitable transmission generate the hydraulic pressure necessary for operating the hydraulic tools.

[0004] Due to the hydraulic pressure required for the use of hydraulic tools, it is not possible to connect them to purely electromechanical pulling and pressing devices. This incompatibility necessitates having at least two compatible drive devices available if both electromechanically and hydraulically driven tools are required.

[0005] Based on this, the invention aims to provide a hydraulic actuator for an electro-mechanically driven handheld pulling and pushing device, as well as a handheld pulling and pushing device, which makes it possible to drive hydraulic tools in addition to electro-mechanically driven pulling and pressing tools.

[0006] The invention solves the problem by means of a hydraulic actuator with the features of claim 1 and by means of a handheld pulling and pushing device with the features of claim 8. Advantageous further developments of the hydraulic actuator are specified in claims 2 to 7.

[0007] The hydraulic actuator according to the invention has a working chamber filled with hydraulic fluid for driving hydraulic tools, i.e., tools whose adjustment requires hydraulic pressure. This working chamber is delimited by an inner wall of a housing body and by an end face facing the working chamber of a hydraulic piston slidably arranged within the working chamber between a starting position and an end position. For driving a hydraulic tool, the hydraulic actuator further has a hydraulic tool connection, which is connected to the working chamber via a hydraulic channel and closed with a self-closing valve. By moving the hydraulic piston from its starting position towards its end position, a hydraulic pressure is generated, which can then supply hydraulic tools connected to the hydraulic tool connection.

[0008] A characteristic feature of the hydraulic actuator according to the invention is that The housing body has a connecting section for the detachable attachment of the hydraulic actuator to a connection section of the pulling and pushing device, and the hydraulic piston has a coupling section for connection to a drive element of the pulling and pushing device that is adjustable relative to the connection section. exhibits.

[0009] The design of the housing body with a connecting section allows the hydraulic actuator to be fixed in place on an electromechanically driven pull and push device, enabling its use for driving hydraulic tools. The hydraulic piston is reliably connected via its coupling section to a drive element adjustable by the electromechanical drive, such as a tool holder of the pull and push device.

[0010] The fixed mounting of the hydraulic actuator on the pulling and pushing device, along with the connection of the driving element of the pulling and pushing device to the hydraulic piston, allows for reliable adjustment of the hydraulic piston between its initial and end positions. This enables the hydraulic actuator to operate hydraulic tools connected to it via the electromechanically driven pulling and pushing device. Switching between the connection options for hydraulic tools and electromechanically driven pulling and pressing tools can be easily accomplished by disassembling and reassembling the hydraulic actuator.

[0011] The connection between the coupling section of the hydraulic piston and the drive element of the push-pull device can, in principle, be made in any way. In the simplest embodiment, the drive element rests against the end face of the hydraulic piston facing away from the working chamber. However, according to an advantageous embodiment of the invention, the coupling section of the hydraulic piston is designed to form a positive-locking connection with the drive element in the adjustment direction of the hydraulic piston. Such a positive-locking connection ensures that the hydraulic piston can be adjusted by the drive element both towards its end position and towards its initial position. The positive-locking connection can, for example, be designed in the form of a thread or bayonet fitting, so that both tensile and compressive forces from the drive element can be transmitted to the hydraulic piston.

[0012] Essential for the function of the hydraulic actuator is a connection between the hydraulic piston and the drive element of the pulling and pushing device. For this 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 pushing device. However, according to a particularly advantageous embodiment of the invention, the coupling section of the hydraulic piston is designed for connection to a drive element of the pulling and pushing device that is configured as a tool holder. The tool holder is typically a component arranged section by section at the end face of the pulling and pushing device and connected to the electromechanical drive, which allows for easy exchange of the pulling and pressing tools.The necessary good accessibility allows for a particularly simple connection of the hydraulic piston of the hydraulic actuator to the tool holder, for example, by bringing it into contact with the tool holder. It is also possible to connect them in such a positive-locking manner that the hydraulic piston is positively locked to the tool holder in both directions of adjustment.

[0013] The connection between the hydraulic actuator and the pulling and pushing device can, in principle, be designed in any way. However, according to a particularly advantageous embodiment of the invention, the connecting section of the hydraulic actuator has a thread or detent element for releasable attachment to the connecting section of the pulling and pushing device, which also has a thread or detent element receptacle. A corresponding embodiment of the invention enables a secure and easily detachable connection of the hydraulic actuator to the pulling and pushing device without the need for additional components and / or locking elements. To release the connection between the hydraulic actuator and the pulling and pushing device, it is only necessary to unscrew it from the thread or to release the detent connection.

[0014] The design of the housing body is generally freely selectable. However, according to a particularly advantageous embodiment of the invention, the housing body is multi-part, in particular two-part. A two-part design of the housing body, in particular, allows the hydraulic actuator to be designed such that it consists of a piston housing and a base body. In this embodiment, the base body can be designed and connected to the piston housing in such a way that the base body partially rests against the hydraulic piston in its initial position, thus defining the initial position of the hydraulic piston within the housing body. The base body also serves to connect the hydraulic actuator to the push-pull device.A corresponding two-part design of the housing body thus allows not only easy assembly and disassembly on the pulling and pushing device, but also easy assembly of the hydraulic actuator and, if necessary, easy maintenance.

[0015] In the simplest embodiment, the hydraulic piston can be moved from its initial position to its end position by simply placing the drive element against the end face of the hydraulic piston facing away from the working chamber. To ensure the hydraulic piston returns to its original position in this case, a particularly advantageous embodiment of the invention provides that the hydraulic piston is pre-tensioned, in particular spring-loaded, towards its initial position. This embodiment of the invention ensures that the hydraulic piston is reliably returned to its initial position without requiring any further modifications to the hydraulic actuator.

[0016] According to a further embodiment of the invention, the hydraulic tool connection is also provided with a quick-release coupling. This allows for easy and convenient changing of the hydraulic tools that can be connected to the hydraulic actuator. The self-closing valve reliably ensures that no hydraulic fluid escapes from the hydraulic actuator during a tool change. Furthermore, the hydraulic tool connection, particularly in conjunction with an advantageously provided quick-release coupling configuration, allows for the connection of a refill or filling of the working chamber with hydraulic fluid.

[0017] The invention further solves the problem by means of a handheld pulling and pushing device for driving interchangeable drawing and pressing tools with a drive unit comprising an electric motor, a threaded drive with a threaded spindle connected to the drive unit and rotatably mounted on a housing body, and a threaded nut rotatably mounted on the threaded spindle and non-rotatably mounted on the housing body via a bearing unit, and a coupling unit connected to a tool holder, which is connected to the threaded nut in such a way that tensile and compressive forces resulting from the direction of rotation of the threaded spindle are transmitted to the coupling unit, and wherein the tensile and compressive device is detachably connected to a prescribed hydraulic actuator according to the invention or further developed.

[0018] The handheld pulling and pushing device according to the invention enables, in addition to the drive of mechanically driven drawing and pressing tools via the hydraulic actuator, also the drive of hydraulic tools, whereby, if necessary, it is possible to switch between a drive of mechanically driven drawing and pressing tools and hydraulic tools in a simple manner by connecting or disconnecting the hydraulic actuator from the pulling and pushing device.

[0019] An embodiment of the invention is explained below with reference to the drawings. The drawings show: Fig. 1 in a sectional view shows a schematic representation of a hydraulic actuator with a hydraulic piston arranged in a starting position; Fig. 2 in a sectional view shows a schematic representation of a hydraulic actuator with a hydraulic piston arranged in an end position; and Fig. 3 in a sectional view shows a schematic representation of a pull and push device with a hydraulic actuator arranged on it.

[0020] Figure 1 Figure 1 shows a sectional view of an embodiment of a hydraulic actuator 1 with a housing body 2 formed from a base body 4 and a piston housing 3.

[0021] Inside the piston housing 3, a hydraulic piston 6 is located between a Figure 1 presented initial situation and a Figure 2The end position shown is adjustable. The inner surface of the piston housing 3, together with an end face of the hydraulic piston 6, defines a working chamber 5, which is filled with hydraulic fluid. Starting from the position shown in Figure 1 In the initial position shown, the hydraulic piston 6, which in this position partially rests with one end facing away from the working chamber 5 against a shoulder 14 of the base body 4, into which in Figure 2 The end position shown is adjustable, whereby during the adjustment hydraulic fluid arranged in the working space 5 can be used via a hydraulic channel 8 to drive a hydraulic tool not shown here, which can be arranged on a hydraulic tool connection 7.

[0022] To reset the hydraulic piston 6 from the in Figure 2 depicted final position in the Figure 1In the initial position shown, in which the hydraulic piston 6 again partially rests against the shoulder 14 of the base body 4, helical compression springs 11 serve to support the hydraulic piston 6 at one end and an inner surface of the piston housing 3 opposite the hydraulic piston 6 in the adjustment direction at the other end.

[0023] To connect the hydraulic actuator 1 with a Figure 3 In the illustrated pulling and pushing device 25, the base body 4, which is connected to the piston housing 3 via an internal thread 12 and an external thread 13, so that the shoulder 14 rests against an end face 15, has a connecting section 9 which is designed for detachable connection to a connecting section 24 of the pulling and pushing device 25, so that the hydraulic actuator 1 can be arranged in a fixed position on the pulling and pushing device 25.

[0024] The push-pull device 25 has a drive unit 16 comprising an electric motor 17, by means of which a threaded spindle 20 of a threaded drive 19 arranged in a housing body 18 can be driven. In addition to the threaded spindle 20, the threaded drive 19 also has a threaded nut 21 arranged on the threaded spindle 20, which is mounted to the housing body 18 in a rotationally fixed manner. The threaded nut 21 serves to drive a tool holder designed as a piston rod 22, which is adjustable in the longitudinal direction of the threaded spindle 20, so that the hydraulic piston 6 can be moved towards the hydraulic actuator 1 by means of the push-pull 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. Reference symbol list

[0025] 1 Hydraulic actuator 2 Housing body 3 Piston housing 4 Base body 5 Working chamber 6 Hydraulic piston 7 Hydraulic tool connection 8 Hydraulic channel 9 Connecting section 10 Coupling section 11 Screw compression spring 12 Internal thread (base body) 13 External thread (piston housing) 14 Shoulder 15 End face 16 Drive unit 17 Electric motor 18 Housing body 19 Threaded drive 20 Threaded spindle 21 Threaded nut 22 Piston rod; tool holder (drive element) 23 Coupling unit 24 Connection section (pull / push device) 25 Pull / push device

Claims

1. Hydraulic actuator for an electro-mechanical driven pulling and compression device (25) for driving hydraulic tools, with - a housing body (2) with a working chamber (5) filled with hydraulic fluid, - a hydraulic piston (6) arranged in the working chamber (5) to be displaceable between a starting position and an end position and - a hydraulic tool connection (7) with a hydraulic channel (8) connected to the working chamber (5) and having a self-closing valve, characterized in that - the housing body (2) has a connecting section (9) for detachably fixing the hydraulic actuator (1) to a connection section (24) of the pulling and compression device (25), and - the hydraulic piston (6) has a coupling section (10) for connection to a drive element (22) of the pulling and compression device (25) which is adjustable relative to the connection section (24).

2. Hydraulic actuator according to claim 1, characterized in that the coupling section (10) is designed for positive connection to the drive element (22) in the adjustment direction of the hydraulic piston (6).

3. Hydraulic actuator according to claim 1 or 2, characterized in that the coupling section (10) is designed for connection to a drive element of the pulling and compression device (25) designed as a tool holder (22).

4. Hydraulic actuator according to one or more of the preceding claims, characterized in that the connecting section (9) has a thread or latching bodies for detachable fixing to the connection section (24) of the pulling and compression device (25) having a thread or latching body receptacles.

5. Hydraulic actuator according to one or more of the preceding claims, characterized in that the housing body (2) is multi-part, in particular two-part.

6. Hydraulic actuator according to one or more of the preceding claims, characterized in that the hydraulic piston (6) is preloaded, in particular spring preloaded, in the direction of the starting position.

7. Hydraulic actuator according to one or more of the preceding claims, characterized in that the hydraulic tool connection (7) comprises a quick coupling.

8. Hand-held pulling and compression device for driving interchangeable pulling and pressing tools, with - a drive unit (16) comprising an electric motor (17), - a screw drive (19) with a threaded spindle (20) connected to the drive unit (16) and mounted rotatably on a housing body (18), and a threaded nut (21) mounted rotatably on the threaded spindle (20) and non-rotatably on the housing body (18) via a bearing unit, and - a coupling unit (23) connected to a tool holder (22), which coupling unit (23) is connected to the threaded nut (22) in such a way that tensile and compressive forces resulting from the direction of rotation of the threaded spindle (20) are transmitted to the coupling unit (23), characterized by a hydraulic actuator (1) detachably connected to the pulling and compression device (25) according to one or more of claims 1 to 7.

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