Handheld pull and compression device and hydraulic actuator

Abstract

The invention relates to a hand-held pulling and compressing device and a hydraulic actuator for a hand-held pulling and compressing device for driving a hydraulic tool, having a housing body containing a working chamber filled with hydraulic fluid, a hydraulic piston arranged in the working chamber so as to be displaceable between a starting position and an end position, and a tool connector having a hydraulic passage connected to the working chamber and having a self-closing valve hydraulic pressure. In order to provide a hydraulic actuator for an electromechanically driven hand-held pulling and compressing device and a hand-held pulling and compressing device capable of driving a hydraulic tool in addition to an electromechanically driven pulling and pressing tool, a housing body has a connection section on the hydraulic actuator, the hydraulic piston has a connecting section for detachably fixing the hydraulic actuator to a connecting section of the pulling and compressing device, and has a coupling section for connecting to a drive element of the pulling and compressing device, which drive element is adjustable relative to the connecting section.

Description

Technical Field

[0001] The present invention relates to a hand-held pulling and compressing device and a hydraulic actuator for driving a hydraulic tool for the hand-held pulling and compressing device, which has

[0002] - a housing body having a working chamber filled with a hydraulic fluid,

[0003] - a hydraulic piston arranged in the working chamber to displace the housing between a starting position and an end position, and

[0004] - A hydraulic tool connection having a hydraulic channel connected to the working chamber and having a self-closing valve. Background Art

[0005] Hand-held pulling and compressing devices of various configurations are known from the prior art. In some known pulling and compressing devices, the pulling and pressing tools that can be connected to these devices are adjusted by an electromechanical drive unit. Another group of pulling and compressing devices provides hydraulic pressure to drive the pulling and pressing tools designed as hydraulic tools. The hydraulic pressure can be generated, for example, by a compressed air drive, whereby the hydraulic pressure required for operating the hydraulic tool is generated by pneumatic adjustment of a pneumatic piston and a suitable transmission.

[0006] Due to the hydraulic pressure required for using hydraulic tools, it is not possible to connect them to purely electromechanical pulling and pressing devices. If both electromechanical and hydraulically driven tools are required, this incompatibility makes it necessary to provide at least two suitable drive devices. Summary of the invention

[0007] Based on this, the object of the present invention is to provide a hydraulic actuator for an electromechanically driven hand-held pulling and compressing device, and a hand-held pulling and compressing device, which can drive hydraulic tools in addition to the electromechanically driven pulling and pressing tools.

[0008] The invention solves this problem by a hydraulic actuator having the features of claim 1 and a hand-held pulling and compressing device having the features of claim 8. Further advantageous embodiments of the hydraulic actuator are given in claims 2 to 7.

[0009] In order to drive a hydraulic tool, i.e. a tool that requires adjustment of the hydraulic pressure, the hydraulic actuator according to the invention has a working chamber filled with a hydraulic fluid, the working chamber being defined by the inner wall of the housing body and the end face of a hydraulic piston, the end face facing the working chamber, the hydraulic piston being arranged in the working chamber to be displaced between a starting position and an end position. In order to drive the hydraulic tool, the hydraulic actuator also has a hydraulic tool connection piece, which is connected to the working chamber via a hydraulic channel and is closed by a self-closing valve. Thus, the adjustment movement of the hydraulic piston from its starting position towards its end position generates a hydraulic pressure, by which the hydraulic tool connected to the hydraulic tool connection piece can be supplied.

[0010] The hydraulic actuator according to the present invention is characterized in that:

[0011] - the housing body has a connecting section for detachably fixing the hydraulic actuator to the connecting section of the pulling and compressing device, and

[0012] The hydraulic piston has a coupling section for connection to a drive element of the pulling and compressing device, the drive element being adjustable relative to the connecting section.

[0013] The design of the housing body with the connection section allows the hydraulic actuator to be fixed in place on an electromechanically driven pulling and compression device so that it can be used to drive a hydraulic tool. The hydraulic piston is reliably connected via its coupling section to a drive element which can be adjusted via the electromechanical drive device, for example a tool holder of the pulling and compression device.

[0014] The fixed arrangement of the hydraulic actuator on the pulling and compressing device and the connection of the drive element of the pulling and compressing device to the hydraulic piston enable reliable adjustment of the hydraulic piston between a starting position and an end position, so that the hydraulic actuator can be used to operate a hydraulic tool connected to the hydraulic actuator via the electromechanical pulling and compressing device. By disassembling and assembling the hydraulic actuator, it is easy to switch between the connection options for hydraulic tools and electromechanically driven pulling and compressing tools.

[0015] In principle, the coupling section of the hydraulic piston can be connected to the drive element of the pulling and compressing device in any desired manner, whereby in the simplest embodiment the drive element bears against the end face of the hydraulic piston facing away from the working chamber. However, according to an advantageous embodiment of the invention, it is provided that the coupling section of the hydraulic piston is designed for a form-fitting connection with the drive element in the adjustment direction of the hydraulic piston. This form-fitting connection ensures adjustment of the hydraulic piston by the drive element in the direction of the end position and in the direction of the starting position. The form-fitting connection can be designed, for example, in the form of a thread or a bayonet lock, so that both tensile and compressive forces of the drive element can be transmitted to the hydraulic piston.

[0016] The connection between the hydraulic piston and the drive element of the pulling and compressing device is essential for the function of the hydraulic actuator. For the connection, a connecting element can be arranged on the hydraulic piston, for example, which can be connected to the drive element within the pulling device. However, according to a particularly advantageous embodiment of the invention, it is provided that the coupling section of the hydraulic piston is designed for connection to the drive element of the pulling and compressing device designed as a tool holder. The tool holder is usually a component which is arranged in sections on the end face of the pulling and compressing device and is connected to the electromechanical drive, which makes it easy to replace the pulling and pressing tools. The good accessibility required for this makes it particularly easy to connect the hydraulic piston of the hydraulic actuator to the tool holder, for example to bring it into contact. It can also be connected in a form-fitting manner so that the hydraulic piston is connected to the tool holder in a form-fitting manner in both adjustment directions of the hydraulic piston.

[0017] The connection of the hydraulic actuator to the pulling and compressing device can in principle be designed in any way. However, according to a particularly advantageous embodiment of the invention, it is provided that the connecting section of the hydraulic actuator has a thread or a latching body for detachable fastening to the connecting section of the pulling and compressing device having a thread or a latching body receptacle. The corresponding embodiment of the invention enables a safe and easily detachable connection of the hydraulic actuator to the pulling and compressing device without the need for additional components and / or fixing elements. In order to release the connection between the hydraulic actuator and the pulling and compressing device, it only has to be unscrewed from the thread or the latching connection is released.

[0018] The design of the housing body can be selected in principle freely. However, according to a particularly advantageous embodiment of the invention, it is provided that the housing body is multi-part, in particular two-part. In particular, the 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 abuts 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 compressing device. Thus, a corresponding two-part design of the housing body not only allows simple assembly and disassembly on the pulling and compressing device, but also allows simple assembly of the hydraulic actuator and, if necessary, simple maintenance.

[0019] In the simplest embodiment, the 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 the return of the hydraulic piston in this case, according to a particularly advantageous further development of the invention, it is provided that the hydraulic piston is preloaded in the direction of the starting position, in particular spring preloaded. This embodiment of the invention ensures a reliable return of the hydraulic piston to its starting position without requiring a further configuration of the hydraulic actuator.

[0020] According to another embodiment of the invention, it is also provided that the hydraulic tool connection has a quick coupler. This enables an easy and convenient replacement of 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 tool replacement. Furthermore, the hydraulic tool connection, in particular in combination with the advantageously provided design as a quick coupler, enables the connection to be used for refilling or filling the working chamber with hydraulic fluid.

[0021] The present invention further solves this object by a hand-held pulling and compressing device for driving interchangeable pulling and pressing tools, which has

[0022] a drive unit having an electric motor,

[0023] a screw drive having a threaded spindle connected to the drive unit and rotatably mounted on the housing body, and a nut rotatably mounted on the threaded spindle and non-rotatably mounted on the housing body via a bearing unit, and

[0024] a coupling unit connected to the tool holder, the coupling unit being connected to the nut in such a way that the tensile and compressive forces resulting from the direction of rotation of the threaded spindle are transmitted to the coupling unit, and

[0025] - wherein the pulling and compressing device is detachably connected to a hydraulic actuator as provided in accordance with the invention or in a further development thereof.

[0026] In addition to driving mechanically driven pulling and compressing tools via the hydraulic actuator, the handheld pulling and compressing device according to the invention is also capable of driving hydraulic tools, whereby, if necessary, switching between the driving of mechanically driven pulling and compressing tools and hydraulic tools can be carried out in a simple manner by connecting or disconnecting the hydraulic actuator to the pulling and compressing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of a hydraulic actuator, wherein the hydraulic piston is set in a starting position;

[0028] Figure 2is a schematic cross-sectional view of a hydraulic actuator, wherein the hydraulic piston is arranged in an end position, and

[0029] Figure 3 Schematic cross-section of a pulling and compressing device with a hydraulic actuator. DETAILED DESCRIPTION

[0030] Figure 1 A sectional view of an exemplary embodiment of a hydraulic actuator 1 is shown, which has a housing body 2 formed by a basic body 4 and a piston housing 3 .

[0031] Inside the piston housing 3, the hydraulic piston 6 can Figure 1 The starting position and Figure 2 The inner surface of the piston housing 3 and the end surface of the hydraulic piston 6 together define a working chamber 5 which is filled with hydraulic fluid. Figure 1 Starting from the starting position shown, the hydraulic piston 6 can be adjusted to Figure 2 In the end position shown, the hydraulic piston partially abuts against the shoulder 14 of the base body 4 with its end face facing away from the working chamber 5 in the starting position, so that during adjustment, the hydraulic fluid arranged in the working chamber 5 can be used via the hydraulic channel 8 to drive a hydraulic tool not shown here, which can be arranged on the hydraulic tool connecting part 7.

[0032] A helical compression spring 11 supported at one end on the hydraulic piston 6 and at the other end on the inner surface of the piston housing 3 opposite to the hydraulic piston 6 in the adjustment direction serves to move the hydraulic piston 6 from Figure 2 The end position shown returns to Figure 1 The starting position is shown, in which the hydraulic piston 6 again partially rests against the shoulder 14 of the basic body 4 .

[0033] In order to connect the hydraulic actuator 1 to the Figure 3 The pulling and compressing device 25 shown is connected to the piston housing 3 via the internal thread 12 and the external thread 13 on the piston housing so that the base 4 that makes the shoulder 14 abut against the end face 15 has a connecting section 9, which is designed to be detachably connected to the connecting section 24 of the pulling and compressing device 25, so that the hydraulic actuator 1 can be set in a fixed position on the pulling and compressing device 25.

[0034] The pulling and compressing device 25 has a drive unit 16, which includes an electric motor 17, by 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 nut 21 arranged on the threaded spindle 20, which is non-rotatably mounted on the housing body 18. The 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 via the piston rod 22 as a drive element by means of the pulling and compressing device 25. The hydraulic piston 6 has a coupling section 10 on its end face facing the piston rod 22, so that the movement of the piston rod 22 is reliably transmitted to the hydraulic piston 6. The piston rod 22 is connected to the nut 21 via a detachably connected coupling unit 23, which at its end opposite to the piston rod 22 abuts against the end face of the nut 21 facing away from the piston rod 22.

[0035] Reference numerals list

[0036] 1Hydraulic actuator

[0037] 2 Shell body

[0038] 3 Piston housing

[0039] 4 Matrix

[0040] 5 working chamber

[0041] 6 Hydraulic piston

[0042] 7Hydraulic tool connectors

[0043] 8 hydraulic channels

[0044] 9 Connection section

[0045] 10 Coupling section

[0046] 11 Helical compression spring

[0047] 12 Internal thread (base)

[0048] 13 External thread (piston housing)

[0049] 14 Shoulders

[0050] 15 End face

[0051] 16 Drivers

[0052] 17 Electric Motor

[0053] 18 Shell body

[0054] 19 Screw drive

[0055] 20 threaded spindle

[0056] 21 Nut

[0057] 22 piston rod; tool holder (driving element)

[0058] 23 coupling units

[0059] 24 connection sections (pulling / compression device)

[0060] 25Pull / Compression Device

Claims

1. A hydraulic actuator for driving a hydraulic tool for an electromechanically driven pulling and compressing device (25), comprising - a housing body (4) having a working chamber (5) filled with a hydraulic fluid, - a hydraulic piston (6) arranged in said working chamber (5) so as to be displaceable between a starting position and an end position, and - a hydraulic tool connection (7) having a hydraulic channel (8) connected to the working chamber (5) and having a self-closing valve, It is characterized in that the housing body (4) has a connecting section (9) for detachably fixing the hydraulic actuator (1) to a connecting section (24) of the pulling and compressing device (25), and The hydraulic piston (6) has a coupling section (10) for connecting to a drive element (22) of the pulling and compressing device (25), the drive element being adjustable relative to the connecting section (24).

2. The hydraulic actuator according to claim 1, characterized in that: The coupling section (10) is designed to positively fit the drive element (22) in the adjustment direction of the hydraulic piston (6).

3. The 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 compressing device (25) designed as a tool holder (22).

4. A hydraulic actuator according to any one of the preceding claims, characterised in that The connecting section (9) has a thread or a latching body for detachably fixing to the connecting section (24) of the pulling and compressing device (25), the connecting section having a thread or a latching body receiving portion.

5. A hydraulic actuator according to any one of the preceding claims, characterised in that The housing body (2) is multi-part, in particular two-part.

6. A hydraulic actuator according to any one of the preceding claims, characterised in that The hydraulic piston (6) is preloaded in the direction of the starting position, in particular by a spring.

7. A hydraulic actuator according to any one of the preceding claims, characterised in that The hydraulic tool connecting piece (7) comprises a quick coupler.

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

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